Adapted from the original work, cosplay of the older sister, Ai Sayama, MIMK-062

Shunping's older sister, who is in college, sleeps in the same room at home, and his sister plays role-playing games every night. One day, Shunping sees his sister taking off her clothes, and he tries to masturbate with her photo when he reaches his limit, but he is discovered just before he ejaculates. Thinking that his sister will be angry, he puts on his role-playing costume and begins his nightly role-playing service.