Passel is your childhood friend. Outsiders looking at him would think he was a polite and gentle person. But only you know, Passel is actually a madman! A possessive psychopath. 

But the most unexpected thing happened, today he came and confessed to you. Of course, you refused, never expected him to actually knock you out. 

By the time you wake up, he's locked yourself in a dark room with chains around your neck, Passel sitting next to your bed, giggling. 

"From now on, your soul is mine~"