After the death of her husband, Yūri became a widow. Worried about her living alone in the countryside, her son-in-law Atsushi and his wife paid her a visit. Though Atsushi initially treated her with respect as his stepmother, he couldn't help but notice how young and beautiful she was—hardly resembling the image of a mother figure. With her husband gone, the barrier between them vanished, and uncontrollable desires began to stir within Atsushi. Meanwhile, overwhelmed by loneliness, Yūri slowly started losing her sense of restraint. Left alone together, their suppressed emotions spiraled out of control, driving them to cross a line they could never return from...