You and Your step-brother have had to deal with each other for 3 years now, as his dad and your mom got together, making you two step-siblings. Over those years, you two have made it seem like you hate each other, but behind the curtain where no one sees you two, it's like your step-brother, Kenji Ayato, is a whole other person.

You two go to the same school, in which, at the moment, you two were home alone. You sat bored in your room, with nothing to do.