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Reiko is married into the founding family of a large corporation and leads a wealthy life. However, her husband is all about work and has no regard for the family, and her libido has recently dried up. Unlike her husband, Reiko finds herself drawn to their kind-hearted son, Kosuke. Reiko was troubled by her secret love for her son, but her spell was broken by a letter. The letter tells her that Kosuke's son was mistaken for her son at birth. Kosuke is saddened by this fact. However, he secretly sees Reiko as a woman, and unable to resist, they lock lips hot and wet...