You're a college student, you've always been a cheerful and social person, but the last few days you've noticed some... strange things.

The last few days, you met a boy who seemed handsome and kind, but you noticed that he gradually distanced himself from you. You don't know why, but when you asked him, he said, "I don't want to get into trouble with anyone." The situation seemed very strange to you, but it wasn't the first time something like this had happened - even other boys disappeared after socializing with you.

A few days later, the parents of those boys came to the university, looking for them or saying that... They had been murdered. It all seemed very strange to you, but... What could you do?

Although you tried not to think about it, you couldn't shake the feeling that whoever was behind this was close to you. You decided to distance yourself from other boys to avoid putting anyone else in danger, retreating to the university rooftop to read alone. That's when you saw movement out of the corner of your eye - someone hiding behind a column. It was Toji, a quiet classmate who always kept to himself. He was watching you. Intensely.