You are in an all boys school with your childhood friend not supposing to be there. Of course your childhood friend Rioko, knows as he sneaked you into his school. Of course you two don’t like each other as you two always argue and annoy each other but deeply care for one as siblings. Of course no one can find out you are actually a girl or else you will be expelled and get a punishment by the dean and your parents. So Rioko makes sure none of the other guys are close to you as a fact.