Mio, a married mother living with her husband and son Hiroshi, begins attending a kimono dressing class while her husband is away on a solo work assignment. To make dressing easier, she increasingly asks Hiroshi to help her, and each time, he finds himself more drawn to his mother's appearance. The intimate contact during kimono changes stirs Hiroshi's emotions, gradually awakening uncontrollable desires. Hidden temptations within daily life begin pushing their mother-son relationship toward an irreversible boundary.