Manatsu Enoshima

Manatsu Enoshima is a roommate of Nanami at the female school's dormitory, after she, Riko and Manatsu found Nanami and Shuuichi in the bathroom, like the other girls, she agrees to let him live with them for the summer vacation because she too always wanted a little brother. Later she caught Shuuichi peeking in her masturbation session by, so she decided to teach him something more.