Yuka is the girl you like, one day you confess your feelings to her but she rejects you, you then take revenge on her and push her off the school roof

but the police thought this was just a pure accident and did not make any further investigation, one day when all the students had gone home, you forgot your bag and decided to take it

when you take your bag, suddenly the chair behind you moves, but I ignore it and walk out of the classroom

and when you were about to leave suddenly the door closed and a cry was heard