Loading
Skip to content
  • HOME
    • "Favorite Crafan" will be released in as little as 5 business days
    • Favorite crowdfan details & application
    • Projects being recruited
    • About return products
    • “Oshi Advertising®︎” media list
    • Complete guide to favourite ads! List of media manual materials
    • New media of attention
    • Recommended advertising jack plan
    • [Japan] Oshi fireworks advertisement
    • [Japan] Peel-off advertisement
    • [Japan] Street vision advertisement
      • [Japan] Transportation advertising
      • [Transportation Advertising] Group Overview Application Form
      • [Transportation Advertisement] Design Templates & Notes
      • [Popular advertisement] Deadline schedule calculation tool
    • [Japan] JOYSOUND Karaoke Advertising
    • [Japan] Adtrack/Mobile Media
    • [Japan] Around the live venue
    • [Korea] Subway / bus / street vision advertisement
    • [USA] Street Vision Advertising
    • [France] Street Vision Advertisement
    • [Hong Kong] Street Vision Advertising
    • [Taiwan] Street Vision Advertising
    • [Thailand] Tuk tuk ads
    • SNS advertising
    • Popular advertising media
    • All advertising media
    • Cappo/Flower Eve Axta production
    • Capho Production / Flower Event
    • 【South Korea】BirthdayCafe list
    • [Korea] List of flower shops
    • Produced by pushing
    • Advertising design/video/announcement flyer production
    • [Create by yourself (still images only)] Canva template DL plan
    • [Request production from our company (still images/videos)] Template arrangement plan/full customization plan
    • [Request production from our company] Announcement flyer production
    • Data check and rework services
    • Currently recruiting “#Oshi Messe®︎” list
    • “#Oshi Messe®︎” Information for customers
    • “#Oshi Messe®︎” Information for offices
    • Information for “#Oshi Messe®︎” venue
    • Blog list
      • Monthly pushing ranking
      • What is the monthly ranking?
      • Vote for your favorite on LINE
    • Articles for Favorite Crafan's Useful
    • Useful article for recommended advertising
      • Useful articles
      • Favorite activities x food
    • Interviewed with experienced advertising
    • Senil/Event Information (Birthday/Kamba/Live)
      • Asian POP Special
      • J-POP Special
      • JK-POP Special
      • K-POP Special
      • C-POP Special
    • YouTuber / VTuber Special
      • Special feature on Asian Actors
      • Special feature on Japanese actors
      • Korean Actors Special
      • Thai Actors Special
    • Special feature on athletes
    • Fundam feature
    • Progressive/recommended advertising questionnaire/market research article
    • BirthdayJAPAN staff's recommendation
    • Senil JAPAN staff introduction
    • Otaku MBTI diagnosis
    • Do an Otaku MBTI diagnosis
    • ISTJ Numerical Analyst
    • ISFJ type: caring hospitalist
    • INFJ type love curator
    • INTJ type calculation engineer
    • ISTP Craftsman Designer
    • ISFP Healing Creator
    • INFP empathetic storyteller
    • INTP type research archive section
    • ESTP type execution operator
    • ESFP type on-site promotion team
    • ENFP type passionate supporter
    • ENTP Negotiation Activist
    • ESTJ type planning manager
    • ESFJ type peace mediator
    • ENFJ type missionary leader
    • ENTJ type strategic planner
    • Experiences and examples
    • Summary of favourite ad examples
    • Individual search for favourite ad examples
    • Video / Design portfolio
    • Partner office/license application service
    • List of affiliated offices/Oshi advertising regulations/official materials
    • Permission application agency service
    • Corporate menu
    • Inquiry form for corporations
    • [For office] Information on advertising alliance
    • [For new advertising media company] New advertising media recruitment information
    • [For existing advertising media companies] Broadcast time sharing
    • [For existing advertising media companies] Sharing of broadcast reports
    • [국] 광 광 진/영상 영상
    • FAQ
    • Frequently Asked Questions
    • Frequently asked questions about Oshikura Fan
    • Frequently asked questions about trafficked data
    • About the trademark of “Oshi Advertising®︎”
    • Request for use
  • Log in
  • Search
★LINE reply within 1 business day on weekdays! [Regular business hours] Weekdays 9:00-18:00, [New customers only] Weekdays 18:00-21:00, Saturdays, Sundays, and holidays 10:00-12:00
センイルJAPAN | 実績5,000件超!推し広告(センイル/応援広告)専門代理店 センイルJAPAN | 実績5,000件超!推し広告(センイル/応援広告)専門代理店
  • HOME
  • "Favorite Crafan" will be released in as little as 5 business days
    • Favorite crowdfan details & application
    • Projects being recruited
    • About return products
  • “Oshi Advertising®︎” media list
    • Complete guide to favourite ads! List of media manual materials
    • New media of attention
    • Recommended advertising jack plan
    • [Japan] Oshi fireworks advertisement
    • [Japan] Peel-off advertisement
    • [Japan] Street vision advertisement
    • [Japan] Transportation advertising
      • [Transportation Advertising] Group Overview Application Form
      • [Transportation Advertisement] Design Templates & Notes
      • [Popular advertisement] Deadline schedule calculation tool
    • [Japan] JOYSOUND Karaoke Advertising
    • [Japan] Adtrack/Mobile Media
    • [Japan] Around the live venue
    • [Korea] Subway / bus / street vision advertisement
    • [USA] Street Vision Advertising
    • [France] Street Vision Advertisement
    • [Hong Kong] Street Vision Advertising
    • [Taiwan] Street Vision Advertising
    • [Thailand] Tuk tuk ads
    • SNS advertising
    • Popular advertising media
    • All advertising media
  • Cappo/Flower Eve Axta production
    • Capho Production / Flower Event
    • 【South Korea】BirthdayCafe list
    • [Korea] List of flower shops
    • Produced by pushing
  • Advertising design/video/announcement flyer production
    • [Create by yourself (still images only)] Canva template DL plan
    • [Request production from our company (still images/videos)] Template arrangement plan/full customization plan
    • [Request production from our company] Announcement flyer production
    • Data check and rework services
  • Currently recruiting “#Oshi Messe®︎” list
    • “#Oshi Messe®︎” Information for customers
    • “#Oshi Messe®︎” Information for offices
    • Information for “#Oshi Messe®︎” venue
  • Blog list
    • Monthly pushing ranking
      • What is the monthly ranking?
      • Vote for your favorite on LINE
    • Articles for Favorite Crafan's Useful
    • Useful article for recommended advertising
    • Useful articles
      • Favorite activities x food
    • Interviewed with experienced advertising
    • Senil/Event Information (Birthday/Kamba/Live)
    • Asian POP Special
      • J-POP Special
      • JK-POP Special
      • K-POP Special
      • C-POP Special
    • YouTuber / VTuber Special
    • Special feature on Asian Actors
      • Special feature on Japanese actors
      • Korean Actors Special
      • Thai Actors Special
    • Special feature on athletes
    • Fundam feature
    • Progressive/recommended advertising questionnaire/market research article
    • BirthdayJAPAN staff's recommendation
    • Senil JAPAN staff introduction
  • Otaku MBTI diagnosis
    • Do an Otaku MBTI diagnosis
    • ISTJ Numerical Analyst
    • ISFJ type: caring hospitalist
    • INFJ type love curator
    • INTJ type calculation engineer
    • ISTP Craftsman Designer
    • ISFP Healing Creator
    • INFP empathetic storyteller
    • INTP type research archive section
    • ESTP type execution operator
    • ESFP type on-site promotion team
    • ENFP type passionate supporter
    • ENTP Negotiation Activist
    • ESTJ type planning manager
    • ESFJ type peace mediator
    • ENFJ type missionary leader
    • ENTJ type strategic planner
  • Experiences and examples
    • Summary of favourite ad examples
    • Individual search for favourite ad examples
    • Video / Design portfolio
  • Partner office/license application service
    • List of affiliated offices/Oshi advertising regulations/official materials
    • Permission application agency service
  • Corporate menu
    • Inquiry form for corporations
    • [For office] Information on advertising alliance
    • [For new advertising media company] New advertising media recruitment information
    • [For existing advertising media companies] Broadcast time sharing
    • [For existing advertising media companies] Sharing of broadcast reports
    • [국] 광 광 진/영상 영상
  • FAQ
    • Frequently Asked Questions
    • Frequently asked questions about Oshikura Fan
    • Frequently asked questions about trafficked data
    • About the trademark of “Oshi Advertising®︎”
    • Request for use
Log in Search Cart 0
Cart 0
Access Denied
IMPORTANT! If you’re a store owner, please make sure you have Customer accounts enabled in your Store Admin, as you have customer based locks set up with EasyLockdown app. Enable Customer Accounts
Apr 27, 2026

[VTuber] Special feature on talents belonging to the 8900 Project! We also explain who is inside and why it is becoming a hot topic.

【VTuber】八九百Project所属タレント特集!中の人や話題になっている理由も解説

This time,VTuber office “8900 Project” special featureWe will deliver it to you!

“How do you read the office name?”

“I want to know the talent I belong to!”

While answering your questions, we will also introduce the profiles of the talent we belong to and rumors about the people inside.

Also,BirthdayJAPAN is an advertising agency that specializes in Oshi Advertising® (birthday/support advertising).📢

We have a track record of supporting more than 5,000 Oshi Ads® (birthday/support ads), and have helped many fans realize their desire to support them!

Read this article and「I would also like to run an Oshi no Oshi advertisement®!」「I'm curious about Oshii Ads®!」If you think so, pleaseBirthdayPlease contact JAPAN official LINE!

“I want to run Oshii Advertising®, but I don’t know where to start…”“What kind of media should I use to advertise?”If you are worried about this, please click here.Manual material listPlease also check out✨

List of media manual materials

In addition, you can now search case studies for Oshi Ads® (Birthday/Support Ads) by medium, genre, and artist!

It is being updated from time to time, so please check it out.✅

See Oshii advertising examples
Table of contents
  1. What is the VTuber office “Yakumo Project”?
  2. Talent belonging to 8900 Project
    1. Profile of Tendo-san
    2. Profile of January 1st (Ninomaetsukihi)
  3. Who is inside (past life)?
    1. Rumors about people in Tendou-san
    2. Rumors about people in January
  4. Let's support your favorite with our favorite advertisement (birthday/support advertisement)!
    1. What is a push advertisement (birthday/support advertisement)?
  5. Make it come true with your friends with “Oshikura Fan”! Dream Push Advertisement (Birthday/Cheering Advertisement) Project
  6. Frequently asked questions about the 8900 Project
  7. Summary
  8. BirthdayLeave it to JAPAN!
  9. ★BirthdayJAPAN SNS information★

What is the VTuber office “Yakumo Project”?

Source

Here, we will introduce the VTuber office "8900 Project".✨

The 8900 Project started as a VTuber agency in September 2025.

How to read“8900 Project (Yakumo Project)”It is.

There are two talents affiliated with the 8900 Project: ``January Ichi'' and ``Tendo San.''

This office was founded by January 1st and Tendou San with the theme of ``a place where you can make many 100s.''😉

I will introduce each profile later🥰

The 8900 Project became a hot topic right after its debut.

The reason for this is the rumor about the "people inside", which I will introduce later.

Also,The latest information on the 8900 Project is disseminated on the official website and SNS.

Please check it out.👇

  • 🩶Official website
  • 🧡X

Talent belonging to 8900 Project

From here, we will introduce the profiles of the talents belonging to the 8900 Project!

Currently, the two members are Hajime January, who founded the 8900 Project, and San Tendou.

Profile of Tendo-san

Source

  • Name: Tendo San
  • Birthday: March 3rd
  • Age: unknown
  • Member color: purple
  • Height: 155cm
  • 🔗X
    🔗YouTube

Tendou San is a boy who lives on the sun and dreams of going to the moon.

Tendou-san is a cheerful and chatty person who can get along with anyone.

My favorite things are sweets and my sister😉

And, Tendou San's fan name is ``San San Gumi'', and his fan mark is ``San San Gumi''.🌞🦇 (taiyou, bat).

Currently, on YouTube, I am streaming songs and games.

Profile of January 1st (Ninomaetsukihi)

Source
  • Name: Tsukihi Ninomae
  • Birthday: January 1st
  • Age: unknown
  • Member color: blue
  • Height: 179cm
  • 🔗X
    🔗YouTube

January 1 is a former assassin (meaning assassin or thug) who lives on the moon even though he longs for the sun.

January 1 likes spicy food and alcohol, and when he's embarrassed, he puts on a fox mask to hide his face.😳

And, the fan name for January is "Tsukinoko" and the fan mark is "🌙🦊”.

Currently, on YouTube, I am streaming songs and games.

Who is inside (past life)?

VTuber is basically a genre that doesn't bring the people inside to the forefront, but it's a rare case like this time when the people on the inside become a hot topic.😳

Here, we will introduce information about the person inside, including whether or not it has been officially announced.

Rumors about people in Tendou-san

There are various speculations regarding the people in Tendo-san, based on their voices and speaking styles.

However, there is no information officially released at this time. (As of April 2026)

Rumors about people in January

There are various speculations regarding the person in January Ichi, based on their voice and way of speaking.

However, there is no information officially released at this time. (As of April 2026)

Let's support your favorite with our favorite advertisement (birthday/support advertisement)!

advertising sample

Recently, I have been seeing more and more various Oshikatsu cultures.😊

Here, we will introduce Oshi advertising (birthday/support advertising), which is one of Oshi-katsu culture.

What is a push advertisement (birthday/support advertisement)?

Have you ever heard of the term "Oshi Advertising (Birthday/Cheering Advertising)"?

What is push advertising?Advertisements for fans to support their favorites”.

This is one of the Oshikatsu cultures that started in Korea.BirthdayAlso called (birthday) advertisement or support advertisement.

Fans from all over the world who want to support their favorites and celebrate their birthdays and anniversaries voluntarily place non-commercial advertisements.😊

In recent years, popular genres have expanded to include Japanese idols, artists, YouTubers, VTubers, and athletes.💡

See Oshii advertising examples

Make it come true with your friends with “Oshikura Fan”! Dream Push Advertisement (Birthday/Cheering Advertisement) Project

"I'd like to run a promotional ad, but I'm worried about the cost and it seems like a lot of preparation..."I'm sure there are people who are worried about this.

What I would like to introduce to such people is “Oshikura fan”.

What is Oshikurafan?

「Individuals launch and plan projectsA service where supporting people donate money to support advertising (birthday/support advertising).」

That's it!

A major benefit is that by pooling support funds among people who agree with the project, it is possible to issue large-scale advertisements that would be difficult to do alone.

BirthdayThis service operated by JAPAN provides full support from project launch to fund collection and management, advertising space arrangement, design production, and return shipping.💁

It is also attractive that the donations collected can be used to plan advertisements (birthday/support advertisements).

So far, club fans such as "G-DRAGON", professional e-sports team "REJECT", and VTuber "Mashiro Nagino" have achieved the target amount and promotion advertisements (birthday/support advertisements) have been carried out!

Oshikura fan

Even if you are a first-timer and don't know where to start, our dedicated staff will carefully support you.🎶

In the unlikely event that the target amount is not reached, there will be no fees and a full refund will be given to supporters, so don't worry.

Also, “I want to be a supporter rather than a project founder.If you have any questions about Oshikura fans, please feel free to contact us on the official LINE page for free chat and telephone consultation!

「I want to know more about Oshikura fans!”, please take a look here!

We will introduce in detail the types of advertisements that can be placed on Oshikura Fan and the process to achieve them.♪

Oshikura fan

Frequently asked questions about the 8900 Project

Is 8900 Project (Yakumo Project) a VTuber agency?
8900 Project is a VTuber agency started in September 2025. "January 1" and "Tendo Sun" belong to this group.
What kind of activities are VTubers “Tendou San” and “January Ichi” who belong to the 8900 Project doing?
Tendou-san and January 1st, who belong to the 8900 Project, distribute songs such as Utattemita and games.
What is the main reason why VTuber from 8900 Project is becoming a hot topic?
The reason why the VTuber of the 8900 Project has become a hot topic is because there are some speculations about the person inside. There are various speculations based on the voice and way of speaking. However, there is no information officially released at this time. (As of April 2026)

Summary

This time, we have brought you a special feature on VTuber office's 8900 Project.😊

Keep an eye on the future activities of the two affiliated talents.

Why not put out a fan advertisement (birthday/support advertisement) to coincide with the important timing of your favorite, such as a birthday, comeback, or debut commemoration?

If you want to give shape to your desire to support your favorites, pleaseBirthdayPlease feel free to contact us on JAPAN's official LINE♪

BirthdayLeave it to JAPAN!

Read this article

“I would also like to run an Oshi Ad® (birthday/support ad)!”

Isn't there a lot of people who thought so?✨

On the other hand, “But,Some people may feel that Oshii Advertising® seems difficult...'' or ``I'm worried about the procedure...''

In such a case, pleaseBirthdayPlease contact JAPAN!

BirthdayWhen you register for JAPAN's official LINE,Auto-response chat will quickly answer any questions you may have regarding Oshii Advertising®!

Additionally, you can chat with our staff or consult over the phone, so even first-time users can use our service with confidence.📞

Consultation about Oshi Advertising® → media arrangement → design production → post-posting report can all be completed with just LINE, so feel free to add us as a friend!

★BirthdayJAPAN SNS information★

BirthdayJAPAN delivers the latest information on "X (formerly Twitter)," "Instagram," "TikTok," and "YouTube."♪

In addition to information about Oshii Ads®, we also constantly send out trends related to actors, idols, VTubers, YouTubers, athletes, and information on advantageous campaigns.📱✨

Please follow us and check the latest information.

X (@birthday_ad_jp)

「BirthdayI want to check the information about JAPAN as soon as possible! ”, please follow X (old Twitter)!

In X,

  • in progressOshi Advertisement® announcement
  • Publication of Oshi Advertising® example photos and videos
  • Distribution of blog articles about actors, idols, VTubers, YouTubers, and athletes
  • Notice of advantageous campaigns

etc.,BirthdayWe deliver the latest information on JAPAN as soon as possible.

#advertisement If you give it out #BirthdayJAPAN🤗💖
Dedicated personnel such as idols, actors, YouTubers, VTubers, e-sports players, etc. will help you spread the word!

Acceptance rate 95%! Started acting on behalf of companies to apply for permission.📷✨
Also open on Saturdays, Sundays, and holidays! We will respond to your LINE inquiry within 1 business day.♪

BirthdayClick here for JAPAN's past achievements🔽… pic.twitter.com/I7uAhioBdp

— BirthdayJAPAN (@birthday_ad_jp) September 12, 2025

 

Instagram (@birthday.ad.jp)

Instagram has implementedOshi Advertising®Introducing case studies!

For those who are thinking, ``I want to try it myself,'' there are many posts that will surely be helpful!

If you save posts that interest you, you can conveniently refer back to them at any time.

Please follow us and use it for your daily promotion.





View this post on Instagram











A post shared by BirthdayJAPAN (@birthday.ad.jp)

 

TikTok (@birthday.ad.jp)

「I want to quickly see examples of Oshii Advertising® in my free time! ”, we recommend following us on TikTok!

You can view it in your spare time, such as while getting ready in the morning or commuting to work.♪

@birthday.ad.jp

🤍Our customer's #favorite advertisement certification shot📸🤍 #SKE48 #Makiko Saito uploaded a photo with #support advertisement😊💕 Source: https://x.com/saitomakiko_628/status/1876490520002011527

♬ Original song - BirthdayJAPAN

 

YouTube (@birthday_ad_jp)

Oshii Ad® examples are also being distributed on YouTube!

Please watch the short video to see the advertisements that interest you.

人気の関連記事

    Share Share on Facebook Tweet Tweet on Twitter Pin it Pin on Pinterest

    YouTuber / VTuber Special

    Recommended articles

    View all
    [Latest 2026] What is a self-produced idol? Summary of “independently produced idols” who handle music and choreography in K-POP
    What is Korean “limousine service”? Host Lee Moo-jin & list of gorgeous guests/Summary of divine performances [Latest April 2026]
    When does “Japanese New World” start? Thorough explanation of trainee list, voting/viewing method [Latest April 2026]
    Summary of popular Korean kids and babies! What programs can you see co-starring idols and children?
    Will ZEROBASEONE disband? How long will the current system be active? Thorough explanation of trends after the contract period ends!
    [2026 BTS Live] A complete guide to the world tour Japan performance schedule, venue, ticket price, and application method!
    Invalid password
    Enter

    Language

    • 日本語
    • ภาษาไทย
    • English
    • 한국어
    • 简体中文
    • 繁體中文
    • Instagram
    • Facebook
    • Twitter
    • YouTube
    • Search
    • Company Profile
    • Refund Policy
    • American Express
    • Apple Pay
    • JCB
    • Mastercard
    • PayPal
    • Shop Pay
    • Visa
    © 2026 センイルJAPAN | 実績5,000件超!推し広告(センイル/応援広告)専門代理店 Unauthorized reproduction or presentation of all content on this site is prohibited. Powered by Shopify
    ✨[Free] Otaku MBTI diagnosis✨

    \Receive a medical certificate of your favorite type! /
    Understand your “Oshikatsu style” with 16 types!
    If you share it with your friends, it will definitely be a hit💖

    👉 Diagnose now and get the “Oshikatsu Medical Certificate”!