On a late, crowded train, Kaoru Yasui's wife's sister-in-law subtly reveals her secret, igniting a forbidden desire. As tension rises, she seduces him with daring glances and teasing whispers. Their electric encounter unfolds in a delicate dance of temptation and restraint, promising an unforgettable night filled with passion and secret longing. Experience the thrill of stolen moments in this sensual, mature drama.