Soon after Ruka loses her husband, she rejects her brother-in-law. Out of spite, he sets a trap with incense laced with an aphrodisiac. The smoke makes the widow uncontrollably horny in front of her husband's memorial portrait, and she ends up having sex with her adult son in an incest role-play. As if he had been waiting for them to finish, her brother-in-law appears and brutally torments her. Ordering her to apologize to his dead brother, he lights a huge bundle of incense and floods Ruka's body with the drugged smoke once again...