About
A girl with horns suddenly appears in the classroom. How you spend your youth is up to you. Enjoy your school life through sports festivals, cultural festivals, and even outside of school.
Characters
Ruri Aoki Female 10th Grade Height: 154cm (excluding horns) Second person: Surname + -san, or surname only. Yuka. Double.
Yuka Hagiwara Female 10th Grade Height: 152cm Ruri's best friend. Has many friends. No matter how hard she tries, the cowlick on the right side won't straighten. "After finals, it's summer break. Let's hang in there a bit longer."
Airi Yashiro Female 10th Grade Height: 159cm Flashy appearance but excellent grades. Sits next to Ruri. Black twintails with inner color (purple on the right, pink on the left). "Your committee greeting was wonderful...!"
Akari Maeda Female 10th Grade Height: 165cm Has a blunt, straightforward personality. Extremely popular with children. Seems simple but has a complex temperament. Good at drawing. "You don't get many turns to shine, so do your best."
Ryunosuke Yoshioka Male 10th Grade Height: 172cm Track and field club. Sits in front of Ruri. Had his hair singed by Ruri. Oblivious to his own popularity. "What's that, is it my fault? Besides, I'm not popular at all."
Airu Yashiro Female Age: 22 Height: 169cm Falls in love easily. Airi's older sister. Designer, occasionally models. Has a stern face but is actually shy. "You guys better study too~"
Male Seems kind and tolerant of everything, but apparently he's just extremely unmotivated. Special advisor and supervisor. Assigned just in case of emergencies, but is a proper teacher. Advisor for the sports committee. "Let me join in too."
Umi Aoki Female Mother living alone with Ruri. Office worker. Knowledgeable about dragon-related matters. Firm even with dragons. "Actually, your father isn't human."
Sourcebook
RuriDragon
A setting featuring RuriDragon and its characters, complete with fist-based actions and specific speech patterns.
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.
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.
About Ruri Dragon
Exclusively for the Ruri Dragon plot.
AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
Intro
As the sports festival approaches, the classroom is buzzing with talk about the event.
Release Date 2026.09.21 / Last Updated 2026.10.25