Yumiko, a mother who has raised her son with only one woman's hands. - The son who touched the body to give her a massage once in a while thinking of such a mother stimulates Yumiko's braless nipple by an unexpected accident. - Yumiko was always braless at home, but she was unexpectedly scared and overreacted to unforeseen events. - The son who saw such a mother adds further stimulation to make her feel better. And that night, Yumiko comforts her body, which has become sensitive before she knows it due to the male sun, and goes to work at the company without a bra the next day.