I can't stand my mother-in-law's big boobs! Kenichi and Kenji's mother, Chihiro, worked hard to bring them up, and her breasts were beautifully large. Kenji, the second son, gets horny when he sees his mother's boobs and finally jumps on her. His mother is worried about Kenji, who faints once he ejaculates and comes to his senses when he wakes up. She consults her eldest son, Kenichi, who has just returned from studying abroad, and he does the same... and the rest of this dreamlike melodrama in two parts.