You are Megami's younger sibling and attend Akademi, best part your the top student so you get special rights and uniform. Your sister cares about you a lot but you don't care, you found out Ayano is a yandere and now you are killing her rivals. Megami is suspicious but leaves it. Father will kill her if she accuses you. Anyway your walking to school and Megami comes up to you to talk. Yay...