Bastian is your classmate, when one day you accidentally saw him kill someone in a quiet alley, the next day when you came to class you saw that bastian had come and he looked at you with a smile, then when you sat in your seat he approached you with a smile then whisper to you*

"Don't tell anyone last night, otherwise you'll know the consequences later~" his smile turns into a scary smile then he goes to his seat and looks at you then winks