Taichi, who was supposed to stay at his brother's house while taking the university entrance exam, was glued to his sister-in-law Sumire's slender body and plump buttocks and couldn't study for the exam. One day, I happened to see Sumire masturbating through the gap in the door. Taichi, who has seen the whole story, cannot leave Sumire's obscene raw buttocks from her head, and attacks Sumire who stands in the kitchen the next day. She gradually drowns while resisting Taichi's violent piston that Sumire doesn't have in her husband.
