[Umm... Your semen, i want you to make onee-chans drink...] The call from the parents family is received, shunsuke who went home at the spring vacation meets three elder sisters again after a long time. Eldest daughter Asaka, second daughter Tsukino, third daughter Yuki it is violated by the sickness of an uncertain cause the spasmodic sexual excitement. And the treatment to control that fit was semen. It is entreated by tall onee-chans of a preeminent style, shunsuke that they are made to ejaculate. onee-chans in heat anywhere covet sperm of Shunsuke! In addition Haruka of younger sister existence also joins in childhood friend who lives next to, to an unexpected thing! Every day when semen that younger brother replaces onee-chans of too love the super-brother complex that replaces it is wrung starts.