MDYD-372 Sayaka Kawase, the erotic novelist sister-in-law, torments her brother's wife's brother.

Satoru, who wants to be a writer, is at the mercy of his sister-in-law Sayaka, an erotic novelist who masturbates in front of him and rubs against him at the dining table. She talks about violent restraint sex with her husband, and on nights when he is away on business she sneaks into Satoru's room and devours pleasure like a female.