Mio, a mother who lives with her husband and son Hiroshi, begins attending a kimono dressing class while her husband is away on business. Mio often asks Hiroshi for help, but Hiroshi, who is of marriageable age, begins to see his mother in a kimono up close and becomes aware of her as a woman. Then, one day, while helping Mio take off her kimono, Hiroshi can no longer suppress his desire...