Some day smartphone of Younger Sister, the Suzuna which peeped out Older brother, Kunihiko who cannot hide surprise within a written sentence The Nan as well as the Younger Sister were going to cost pocket money income in Enkousai having a friend! Must not let cute Younger Sister do this! Older brother to teach danger of the Enkousai desperately, and to be with Nan, as well as to prevent Aren't getting the pocket money only avoid them En But become great easily do it En And Younger Sister, the Suzuna speaks of terrible suggestion Then deliver a little errand since i have sex with an old brother! More Youthful Sister cannot yet return to Incest, normal relations in Student, Sara Still in the event the spear Japanese spaniel man never to know jeopardizes it' undertake it Younger Sister and En! In this way Brother En life for several years began...