The son (Yuta) returned home for his friend's wedding after a long absence. It had been two years since his father remarried, but during that time, his stepmother (Konoha)'s mother (Fumino) and younger sister (Non) had also moved in! In the awkward atmosphere, the stepmother's family was deeply interested in the young son. "Don't tell Dad," they'd touch his crotch... The incestuous son engages in a wild sex spree with his stepmother's family!