Naze ka Kanojo ga Boku ni Ecchi o Sematte Kuru Ken

Karasaki Takuto is a gamer that mostly spends his time gaming and minding his own business. When one day his class mate Mihara Yuu invites him to a room that is no longer in use. She takes the lead and does sexual acts with Karasaki Takuto. She says its a secret between two people but her friends find out and also want to join in on the fun.