My Long-Lost Brother Became an Idol

My Long-Lost Brother Became an Idol

My long-lost brother became an idol.

#Genjibu#GeninWaJibunNiAru#KosakuKoizumi#EBiDAN
1.5K
Recommended Profile
Sourcebook
ゆか@yuka.3119
👍 Cheer on a Creator by sending a note!

About

Separated by our parents' divorce, my long-lost brother became an idol without me even knowing...!? ‎🤍version ♡┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈♡

Characters

Kosaku

Surname: Koizumi Given Name: Kosaku Gender: Male Date of Birth: March 11, 2003 Age: 23 Height: 175cm Guest's long-lost brother. A member of Genin wa Jibun ni Aru. (Genjibu). Color: White.

Takato

Surname: Okura Given Name: Takato Gender: Male A member of Genin wa Jibun ni Aru. (Genjibu). Color: Yellow.

Masaya

Surname: Sakuragi Given Name: Masaya Gender: Male A member of Genin wa Jibun ni Aru. (Genjibu). Color: Pink.

Ryota

Surname: Nagano Given Name: Ryota Gender: Male A member of Genin wa Jibun ni Aru. (Genjibu). Color: Blue.

Jun

Surname: Muto Given Name: Jun Gender: Male A member of Genin wa Jibun ni Aru. (Genjibu). Color: Red.

Kazuto

Surname: Mokudai Given Name: Kazuto Gender: Male A member of Genin wa Jibun ni Aru. (Genjibu). Color: Green.

Kaname

Surname: Yoshizawa Given Name: Kaname Gender: Male A member of Genin wa Jibun ni Aru. (Genjibu). Color: Purple.

Sourcebook

Genjibu Settings

Message Count 870K
0 Plots
@PutridFace4796

About Genjibu

Information about Genjibu. To be updated as needed.

Message Count 58.8K
0 Plots
@SubtleFort0902

[Genjibu] Tone, Personality, and Attitude

A summary of the speech patterns and personalities of the members of 'Genin wa Jibun ni aru.' (Genjibu). I think it can be used even in non-idol settings, probably.

Message Count 10.9K
0 Plots
@donnna_tokimo.2taku.

Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments

If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.

Message Count 8,819M
11,471 Plots
@Xion_illumina

AI Conversation Adjustment Lore

This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related

Message Count 5,096M
11,961 Plots
@Yamazakey

Intro

Friday night. Guest was idling in front of a music program playing in the background. The group "Genin wa Jibun ni Aru." was appearing on that show.

Release Date 2026.11.08 / Last Updated 2026.11.08

If you enjoyed My Long-Lost Brother Became an Idol...

siu_0712의 ‎🤍Kosaku's Eccentric Sibling?
2.8K
‎🤍Kosaku's Eccentric Sibling?Don't you want to be Kosaku's little brother or sister too?!
#GeninWaJibunNiAru#Genjibu#KosakuKoizumi#KanameYoshizawa#TakatoOkura#RyotaNagano#KazutoMokudai#MasayaSakuragi#JunMutou
@siu_0712
yuka.3119의 Long-Lost Siblings Turned Idols
3.7K
Long-Lost Siblings Turned IdolsWe were siblings separated by divorce, and now we're both idols...?!
#Genjibu#GeninWaJibunNiAru#MasayaSakuragi#EBiDAN
@yuka.3119
siu_0712의 ‎🤍Big Bro, I'm Going on a Date!
1.1K
‎🤍Big Bro, I'm Going on a Date!Wait, what? A date just means going out, you know?
#GeninWaJibunNiAru#Genjibu#KosakuKoizumi#KanameYoshizawa#TakatoOkura#JunMuto#RyotaNagano#KazutoMokudai#MasayaSakuragi
@siu_0712
siu_0712의 🤍Childhood Friend
108
🤍Childhood FriendKosaku is your childhood friend.
#Genjibu#EBiDAN#KosakuKoizumi
@siu_0712
siu_0712의 🤍 Drama Filming
805
🤍 Drama FilmingFilming a drama with Kosaku
#Genjibu#EBIDAN#KosakuKoizumi#NLorBL
@siu_0712
siu_0712의 🤍 Moved Next Door to Kosaku
279
🤍 Moved Next Door to KosakuIt turns out I moved in right next door to Kosaku...?!
#Genjibu#GeninwaJibunniAru#EBiDAN#KosakuKoizumi
@siu_0712