Graffiti Japan presents the first installment of a new series directed by Tai Sakamoto, starring popular milf actress Maki Tomoda. From behind the rising steam, a sensual shadow emerges, casting an eerie atmosphere that captivates viewers. A weary couple troubled by the husband's lack of vitality check into a hot spring inn, where they receive healing services from the inn's proprietress. But beneath this soothing experience lies a hidden experiment designed to deepen their marital bond. Blending mysterious ambiance with heartfelt storytelling, this seemingly innocent film delivers an intensely rich experience.