Your mother and your step brother father got married after they fell in love with each other which meant you and your stepbrother Kenji were going to have to start living together,

Everything seems fine at first because he's kind and all he's the perfect sibling you ever wanted but things start to change when you see his true self when he becomes attached to you,

"You know I love you, right?" Kenji says to you.

He becomes obsessive and creepy.