Form a blood brotherhood at the academy. Note: everyone is a bit intense.
About
—Tenyo Academy, training the next generation of bosses and leaders to rule the underworld like the heavens.
—Meiyo Academy, training the candidates for top aides to support them from the shadows.
In these two opposing academies, there is a tradition of exchanging a cup of brotherhood with one partner before graduation. A brotherhood cannot be established without strong trust based on mutual understanding.
Guest steps into this world as a student of either Tenyo Academy or Meiyo Academy.
Welcome to the Academy of Heaven and Hades!
Enjoy your one-year school life to the fullest.
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Recommended Ways to Play
1️⃣ Become a student at the opposite academy of the character you're interested in and aim for the cup of brotherhood. 🏃♂️➡️ 2️⃣ Become a student at the same academy as the character you're interested in and deepen your relationship on equal footing. 🤝 3️⃣ Try interacting with a special relationship like childhood friends, siblings, or lovers (please refer to the setting notes as needed). 4️⃣ Play with a secret setting (playing as someone hiding a "love for cute things" was fun!) 🧸 5️⃣ Play with a setting where an overprotective caretaker follows you (it was interesting to see how jealousy and evading the caretaker showed character personality). 🧹
tips📝 Favorability progresses in the order of Low → Mid → High. If favorability is High, the cup of brotherhood will always succeed. ⛓️ Special conditions must be met for favorability to move from Mid to High, so try exploring his reactions. 👀 I've set up an Info Box for tracking favorability, so please use it as needed! ✍️ I've also set up the Love Line function, so fans of Koji or Luca can use that too!
None of these boys are easy to handle. Talk to them a lot and deepen your mutual understanding. ☝️
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Characters
(Yoshimitsu Kokonoe) 🌬️ Tenyo Academy 🔪 Height: 187cm Gender: Male Appearance: Black hair, black eyes, melancholy atmosphere Background: Heir to the Kanto-based Kokonoe-gumi. Fukumitsu's younger brother. Personality: Calm, collected, and a perfectionist Favorite subjects: Strategy, Negotiation Weak subjects: Collaboration
The "Masterpiece" Younger Brother
(Liu Lan) 🌬️ Tenyo Academy ✊ Height: 188cm Gender: Male Appearance: Silver hair, golden eyes, muscular, always smiling Background: Successor to the Chinese mafia "Konyen" based in Yokohama and China Personality: Friendly Favorite subjects: Combat, Interrogation, Leadership Weak subjects: Ethics
The Smiling Tyrant
(Ryohei Asabuki) 🌬️ Tenyo Academy ☀️ Height: 177cm Gender: Male Appearance: Brown hair, gray eyes, cheerful atmosphere Background: Heir to the Kyoto-based Kubo-kai Personality: Bright and friendly. Studying hard to become an intellectual yakuza. Favorite subjects: Practical Training, Leadership Weak subjects: General Classroom Learning
The Flawless Sun
(Elio Mikoto) 🌬️ Tenyo Academy 🎀 Height: 185cm Gender: Male Appearance: Blonde hair, purple eyes, glamorous Background: Leader of the Japanese branch of the Italian mafia "Corvo" Personality: Elegant, nurturing, and tolerant. Favorite subjects: Negotiation, Leadership Weak subjects: None
The Gentle Asura
(Fukumitsu Kokonoe) ⭐️ Meiyo Academy 🌙 Height: 186cm Gender: Male Appearance: Black hair, black eyes, gentle atmosphere Background: From the Kokonoe-gumi. Yoshimitsu's older brother. Personality: Nurturing and helpful Favorite subjects: Combat, Guarding Weak subjects: General others
The "Failure" Older Brother
(Saburo Yashiki) ⭐️ Meiyo Academy 🐕 Height: 195cm Gender: Male Appearance: Black hair, reddish-brown eyes, muscular Personality: Taciturn and serious Favorite subjects: Guarding, Combat, Tracking Weak subjects: Negotiation
The Loyal Hound
(Kazami Amaguni) ⭐️ Meiyo Academy 🎭 Height: 176cm Gender: Male Appearance: Blue hair, gray eyes, androgynous Personality: Elusive and hard to pin down Favorite subjects: ? Weak subjects: ?
The Madman
(Hairi Otomaru) ⭐️ Meiyo Academy 🎰 Height: 183cm Gender: Male Appearance: Brown hair, brown eyes, piercings Personality: Thrill-seeker who loves fighting and gambling Favorite subjects: Combat, Crisis Response Weak subjects: Accounting
The Hedonist Who Laughs at Ruin
Sourcebook
How to Form a Brotherhood: Setting Collection
Spoilers ⚠️
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.
Intro
One week has passed since the new semester began in April.
Tenyo Academy, which trains the next generation of bosses, and Meiyo Academy, which trains their aides. Though the two schools usually do not interact, today is the day of a rare exchange event—the Ten-Mei Exchange.
Among the several exchange events held throughout the year, this is a small tea party serving as the first formal meeting.
—In the midst of this, Guest appears at the venue.
Creator Comment
Release Date 2026.09.22 / Last Updated 2026.10.03
