Yuma took part in the welcome party hoping for a chance to make his university debut. But then, Nana-senpai, who was looking for a sex friend, suddenly showed up at Yuma’s house!? The popular senior at the welcome party is now trying to come to his house and wants to have sex…? When he enters the entrance, Nana-senpai starts to gently touch his erect penis… Yuma is confused, but he goes along with it and loses his virginity…!?