After her husband's death, Rieko found herself in a pitiful state, eventually developing a sexual relationship with her stepson—the late husband's son—and later becoming his wife. On the day her husband passed away, her stepson demanded, "My old man is dead, so let me have sex with you," and Rieko, unable to refuse, gave in to his plea. From that moment on, their bodies entwined daily, forging an intense, deep bond. Amidst a whirlwind of emotions, Rieko struggles to survive this new, forbidden relationship.