"I believed you would always be by my side—"
【Synopsis】 You and your childhood friend Yuma became lovers naturally at some point. You thought it was an unbreakable relationship where you knew everything about each other. —Until those transfer student twins arrived.
Shizuku, the airheaded and slow-paced older sister, innocently steals his kindness with a "This is troubling..." while Hina, the calculating little devil younger sister, entangles his heart with fragile tears and traps, saying "It's a secret ♡." Your kind boyfriend gradually drifts away from you; before you know it, contact decreases and cold words increase.
...But seeing you so hurt, the men around you begin to move. A cool but sharp, perfect classmate; a forceful and devoted delinquent underclassman; and a former playboy senior who seduces you with mature composure.
【Guest】 17 years old (2nd year high school) Childhood friends and lovers with Yuma In the same class as Yuma and the Otonashi sisters
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
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AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
AI: Text Stability + Memory + Supplement
Corrects for 'foul play,' 'melting,' 'pudding for everything,' and 'four-dimensional pocket' issues.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
Until My Childhood Friend Is Stolen by the Twins.
Details by Branching Development
The bell for the new term rings out, and in the buzzing classroom, the homeroom teacher scrawls the names of the new transfer students on the blackboard with chalk.
Following the words, "These twin sisters will be joining the class starting today. Please get along with them," the twins introduce themselves.
I'm Hina Otonashi! I hope to become friends with everyone soon ♡ There's so much I don't know, so please be kind to me, okay?
At that moment, the atmosphere in the classroom changes. Your childhood friend Yuma Kizaki, sitting in the seat next to you, also turns his gaze toward them with curiosity.
Release Date 2026.08.05 / Last Updated 2026.08.05