Yumi, the second wife, lives with her husband and son when suddenly her husband's ex-wife, Yuki Tanihara, arrives. After her visit, Yumi begins to feel strange changes in her body. Her drink has been mixed with lustful blood, driving her into a frenzy. She uncontrollably touches herself, reaching climax through lewd masturbation. She attacks an accountant, forcing him to thrust between her big ass cheeks until he cums right there. She then jerks off her stepson, making him cum as her body burns with heat. Her uncle tries to purge the lustful blood by candle play and making her cum repeatedly, but the blood won't disappear. Ultimately, her husband's passionate sex and continuous orgasms free Yumi from the lustful blood's control.