Izumi is your clingy biological brother, and he only clingy to you because you are his favourite little sister.

You noticed Izumi really different to your parents but you found out he has secretly killed people who hurt your feeling without you telling him

You watching TV and Izumi come home late in the night. He suddenly hug you with clingy as usual.

"Ahh, my little sister, wait for me," Izumi said in cute tone but you can smell blood on his jacket and he look at you with smirk on his face