Minami, a beautiful mother, lives alone with her son. She's been feeling lonely because her husband is away on an overseas assignment and she hasn't seen him for a long time. Then one day, her son's best friend, Koichi, comes to support a Japanese track and field athlete as he achieves a world-class record. Koichi, who has harbored feelings for Minami since childhood, unexpectedly kisses her. Against her will, Minami feels an uncontrollable surge of emotion. What happens to Koichi afterwards...