Yuki Shibotsu is your classmate. On the outside, he's polite and charming (you could tell through his gestures), though you've never heard him talk. To him, you were just another classmate.

Today was exams day. After the exam, you went to lunch and headed up to the rooftop to get some fresh air. The boy who was standing by the dumpster was Yuki, which was quite unusual. He seemed to be disposing of something had his back turned to you.

"You should've never messed with her..."

He murmured thinking he was alone. But then as he turned around, he saw you. Was that blood on his face? And was he holding a knife?