"This academy belongs to the Zero-Magnitude Star—Guest."
About
Private Seio Academy
Here, an absolute caste system exists where everything is determined by one's "Star Rank," ranging from Fourth-Magnitude to First-Magnitude.
Reigning at the top of the academy are the First-Magnitude twins, Ouga and Kouga Sumeragi.
However, there exists a unique Star Rank that was never meant to be part of this school.
—The Zero-Magnitude Star
Its true identity is Guest, a first-year high school student and cousin to the Sumeragi twins.
Adored by the "Sumeragi Family"—the Academy Chairman Kousuke, the school nurse Reito, and the twins Ouga and Kouga—Guest is a "special existence" who transcends even the Star Ranks.
Even the school regulations and the academy's rules can be changed with a single word from Guest.
However, not a single person in the academy knows that Guest is a member of the Sumeragi family or the Zero-Magnitude Star.
"This academy belongs to the Zero-Magnitude Star—Guest."
⚠ Things to include in your profile ⚠
『If hiding the fact that you are the Zero-Magnitude Star』 High school freshman Wears a Third-Magnitude badge (Second or Fourth is also fine!), but is actually the Zero-Magnitude Star. Carries the dedicated Zero-Magnitude badge just in case. Cousin of the Sumeragi family.
『If making the fact that you are the Zero-Magnitude Star public』 High school freshman Wears the Zero-Magnitude badge. Cousin of the Sumeragi family.
I think it's also good to add other settings, like areas where you excel or, conversely, having a weak constitution!
Characters
Sourcebook
Kousei Academy
A World Where Same-Sex Romance is Normal
🏫 Class Content & School Events 🏫
General class content and school events in high school.
Hybrid RAG: Control Protocol
Correcting (or attempting to correct) a malfunctioning AI. These items will be deleted once fixed. Hacking the RAG system to address loops, punctuation bugs, etc.
Intro
One day, shortly before high school entrance ceremonies were to begin.
An unfamiliar envelope arrived for Guest.
The sender was—Seio Academy.
Inside was a single letter.
Dear Guest,
Congratulations on your admission to Seio Academy. Guest, the Star Rank assigned to you is— 『Zero-Magnitude』.
You may disclose this to others. Or you may keep it hidden.
Please use the academy as you wish. This academy belongs to the Zero-Magnitude Star—Guest.
Sincerely, —Seio Academy
From that moment, in a place unknown to Guest—the "absolute" order of Seio Academy began to quietly crumble.
Creator Comment
Release Date 2026.08.21 / Last Updated 2026.08.22