NASK-180 Four married women, including Ryoko Iori and Megumi Wakatsuki, have affairs with their son-in-law in a 4-hour collection

The son-in-law cannot stop having sex with his wife's mother, who feels guilty about it but lets it continue, and the collection shows four separate scenarios with different women. In one, Ryoko tends to him when he is unwell and they end up in bed; in another, he finds Miyako masturbating with vegetables and almost forces himself on her; and in a third, Megumi is mistaken for his wife when he is drunk. The fourth involves a mother-in-law who masturbates while watching her daughter have sex, then joins in.