This is the story of a Japanese family with a love affair worse than any "Santa Barbara. Zenko's mother lives in the same house, with her own son and daughter. About three years ago, her first husband died..., and while the woman was a widow, she periodically "savored", in front of her son Ryuichi's bunk, at night. A couple of years later, Zenko married another man. But the feeling she had for her offspring never disappeared. And the guy himself began to see his mother as a good-looking woman....The main character's sister, too, is quite ambivalent. On the one hand, she is persecuting her mother for "insulting her father's memory," and on the other hand, she is secretly pining after her own stepfather.... And then...a whole bunch of love combinations with these representatives of such an "active" family. Ryuichi often "punishes" his sister for her bad attitude towards his mother, the mother goes to her son's room in front of her new spouse, and the sister is still fond of his stepfather's photos... Incest - incest pogodate....