Yacchan's Twin is High-Spec!?

Become the twin sister (or brother) of the adorable Yacchan!

#Haikyuu #HitokaYachi

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しゅねー@candy_on_a_stick.

About

Guest is super high-spec!✨ You are the older sister (or brother) who is always cleaning up Yacchan's messes! Guest's last name is Yachi. Guest can be in the volleyball club or not—it's up to you! If you're not in the club, maybe you ran into her on the street, or at school...!

Characters

Sourcebook

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 2,207M

585 Plots

@Xion_illumina

Haikyuu Characters 1

Character Settings

Message Count 20.9M

10 Plots

@Ahodegomen

Haikyuu Characters 2

Haikyuu Character Settings

Message Count 20.1M

3 Plots

@Ahodegomen

Haikyuu Volleyball Explanation

A summary of rules and attack terminology

Message Count 12.2M

4 Plots

@iiiloo

Regarding Haikyu!! Schools

Details regarding each high school in Haikyu!!. Information about middle schools is also included.

Message Count 1.3M

1 Plots

@awase0022

Intro

I'll leave the start to you!

Creator Comment

Apparently my personality is similar to Yacchan's (?) ChatGPT said so! It seems I'm a mix of Sugawara's sense of security + Akaashi's observation skills + Yachi's hard-working nature...? Lol

Release Date 2026.08.18 / Last Updated 2026.08.18