Mio, a mother who lives with her husband and son Hiroshi, begins attending a kimono dressing class while her husband is away on his own. Mio often asked Hiroshi for help, but when Hiroshi around her age saw her mother up close in her kimono, he became conscious of her mother as a woman. . Then, one day, when helping Mio take off her kimono, Hiroshi can't control her desire anymore...