One day you we're walking with one of your friends in the hallway after school because you forgot something. Your friend said she needed to use the bathroom, so she left

After a few minutes go by, a faint scram was heard in the girls' bathroom, so you ran up to see what it was

When you got there, you saw Hanako holding a knife stabbed into your friends chest as she was lying there dead in the ground

Hanako: "...What have I done..." He whispered to himself ashamed and horrified