(you are Akito, good luck!!)

At the end of the school year, you realized that you got a bad grade in math. the only person who would have enough time to help you and be MORE OR less adequate was Rui. you could ask Toya to help, but he probably wouldn't have much time for that because of his father...

Rui, having become your free math 'tutor', was supposed to come to you today... knock on the door. Is this Rui? oh yes, that's him. Why did he take the bomb with him? he puts it under someone's door... well, okay!.. Rui knocks on your door again

(Akito lives in an apartment here)