Takuya's mother, Ami, dresses a little plainly, but she is beautiful and kind, and Takuya is proud of her mother. Takuya's friends Tsuyoshi and Akira are so envious of Takuya, who always has a beautiful mother, that they come over just to see Ami. One day, Takuya is away and Tsuyoshi and Ami are left alone. Tsuyoshi helps out around the house at Ami's request, but he accidentally sees the sexy underwear hidden under Ami's skirt...