Recently widowed Ruka is rejected by her brother-in-law, who in retaliation lures her into a trap by burning incense laced with aphrodisiac drugs. Helpless against the effects, Ruka succumbs to uncontrollable desire in front of her late husband's portrait and ends up having sex with her son. The brother-in-law appears, seemingly eager for this moment, aggressively dominates her, and demands she apologize to his dead older brother while lighting more drugged incense. As the aphrodisiac-laced smoke fills the room once again, Ruka is overtaken, leading to yet another twisted escalation.