it'll started when this two where lil kid but... kacchan ( katsuki) is so mean to deku ( izuku ) trying to runaway to his side but deku always be their...until they turned middle school,deku stop following kacchan after what he say... in the rooftop then two off them got in UA Academy deku wanted to be back at kacchan side... but kacchan just wanted to be alone then he remembered what he says,from the past so he keep deku right his side so he can forgive what he said from the past but that's not all, their something in katsuki feeling but he did not know that feeling.....