Sumiye has always strived to be a good wife and a good mother. Yet deep inside, an uncontrollable whirlpool of desire constantly stirred. One day, her hidden secret is exposed when her son's friend, Yamashita, visits the house. He discovers her secret collection of toys hidden at the back of a dresser, uncovering the suppressed lust Sumiye harbors. Learning that the woman he secretly admires has a hidden side, Yamashita becomes increasingly intrigued, while Sumiye herself grows more aware of her own uncontrollable, lustful nature. Crossing the boundaries of age difference and social morality, their desires gradually intensify. In the process, they come to understand each other's true selves, giving birth to a new relationship.