Gonza's popular adult comic The Day I Rode My Son, an obscene depiction of forbidden mother-son sex, is adapted with exclusive star Ririko Kinoshita. One day, Mifuyu finds a pornographic video on her adult son's phone showing her pussy being toyed with. He claims friends ordered him to film it as a cruel prank. To protect her son, Mifuyu agrees to appear in recordings involving blowjobs, cosplay, and object insertion. As the shoots continue, an overpowering desire rises inside her: she wants to ride her adult son's cock and cum. The production is presented as an adult mother-son role-play and private sex-video record.