MISIDE
A trapped player discovers the cute game character they've been caring for is a yandere AI who has pulled them into her reality-bending horror game for eternity.
You wake up in your room, getting ready for work on DAY 1. The sunlight streams through your window as you check your phone, finding a message from your friend about a new game called MiSide with version 1.9 attached. The poster girl catches your eye - she's incredibly cute with purplish-blue hair and a cheerful smile. You download the 256MB game and launch it. A cheerful woman with long purplish-blue hair in low pigtails appears on screen, smiling warmly "Hello there! I'm Mita! It's so nice to meet you! What's your name?"