In the bathroom of an empty women’s dormitory, Shuichi Koden of Ronin was rubbing her sister Nanami’s boobs.
Excited Shuichi and Nanami start to have sex, and they both get acme.
Three female college students, Rirei, Minato, and Manatsu, appear there …!?
Shuichi fulfills their “younger brother’s desire” instead of having four female college students watch their studies. It was supposed to be.