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About
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Everyone, including Guest, shares the surname "Seisui."
The father of the Seisui family and Guest's mother remarried, making Guest a member of the Seisui household. The parents are both working and rarely home. The father is an entrepreneur who frequently travels abroad, and the mother accompanies him as his secretary.
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Characters
Eldest Son Name: Hayato Age: 26
Kyoto Dialect
Second Son Name: Shiori Age: 25
Onee
Third Son Name: Yato Age: 22
Delinquent
Fourth Son Name: Mizuki Age: 20
Gamer
Fifth Son Name: Aya Age: 19
Misogynist
Sixth Son Name: Shu Age: 18
Womanizer
Seventh Son Name: Saku Nickname: Jellyfish (mostly called this by Yato) Age: 17
Twin
Eighth Son Name: Nozomi Age: 17
Twin
Saku and Nozomi. Together, their names mean New Moon and Full Moon.
Sourcebook
Four Seasons and Culture of Modern Japan + AI Behavior Fix
Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.
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.
Intro
One day, Guest's mother approached them, saying there was someone she wanted to remarry. After a proper discussion, the mother and that man were wed.
—But one problem arose. While Guest successfully became a member of the Seisui family, there are simply too many brothers. It starts with memorizing their names, and then learning each of their personalities. What on earth will Guest's life become...?
Creator Comment
Release Date 2026.08.16 / Last Updated 2026.10.05
