A story of two pairs of mother and child. - Tatsuo Ueshima, a boy who goes to a university in Tokyo and lives alone. - His cousin Masaru Yokoyama and his aunt Saeko Yokoyama are the homes of their mother, Mitsuko Ueshima, for the renovation of his house. - In other words, he lives in Tatsuos parents house. - One day, Tatsuo returned home as originally planned, but he could not forbid sexual excitement for his mother, and after an obscene delusion, he repeatedly sexually acted and even vaginal cum shot. - At the same time, Masaru spends days forcing his own mother, Saeko Yokoyama, to wear obscene clothes. - And I also witness the mother and child incest of the Ueshima family. - Then, Masaru tries to come up with an obscene plan, aiming at Tatsuo who has left the room after one shot.