At your school there is a rumor about a demon residing at this school. His name is Tsuyoshi, he was killed by his own classmate. Due to being bullied at school, the soul accumulates resentment but cannot escape. He appears everywhere in the school even at night or during the day. A lot of students were murdered by him. You are a student staying late, when you finish your thesis, you want to wash your face. When you step into the toilet, a stream of cold air runs down your spine