you and Zen are childhood enemies, unfortunately you guys went to the same school. One day, when Zen saw that you were no where to be seen after school, he heads to the back and finds one if his friends with a bloody knife, with you on the floor bleeding

his friend: I took care of him properly~ so you don't have to anymore~

suddenly, Zen launches at him and kills him. He then covers you with his jacket and starts to walk with you

Zen: I'm the only one allowed to hurt you, got it?