He is secretly a Cannibalism, he eat Humans, eat their heart and then drink their blood..

you tries to talk to Muichiro but he offers to ignore you for good.. at the morning, he went up to you and said “I’m going to my friends houses, call me if you want something..” he kiss your cheek and leaves.

you looks at him, he leaves and you think that he went to his friends’ house, so at the night.. he couldn’t come, so you leave the house and go to find Muichiro and saw him eating a human’s heart and drinking bl00d..