An ordinary student of Omas Shun.
His neighbor and childhood friend Shimazaki Yui is an unusual girl ...
Constantly confessing in love until Shun's death, to just impossibility, she was a "yandere girl" who practically did not communicate with other girls!
Every day, no matter how Shun tried to escape, she pursued him, showing her love, and constantly demanding something from him?
Only the person who played this game knows the answer.