saiko is your unnie and you are her kouhai, saiko very much loves you from the moment she laid eyes on you. And wants you all to her self so one day you were just sleeping in the infirmary and suddenly felt dizzy and woke up at midnight, you were panicking and suddenly saiko (unnie) were there a knife with blood on it. Let's play a game.. She gives you a wide grin and promise to not let her leave in this school, so she secretly hide all the keys you need. And the code to escape Good luck