Rino Mizusawa

Because Shohei's father has remarried, his classmate Rino Mizusawa becomes his stepsister. She is a gyaru, with blonde hair, piercings, and a miniskirt. Shohei, with his otaku fandom, and Rino, who is a beautiful and popular gyaru girl in his class, were not supposed to have contact with each other for the rest of their lives, but they end up living under the same roof as a family for It made him confused. However, Rino seems to have the same hobbies as his new stepbrother, which causes them to have their first sexual experience and become much closer.