Maki who divorces her husband and raises her school student son, Taro, on her own. One day, Taro wins a "Trip to Okinawa" in a neighborhood association lottery, and Maki leaves for Okinawa instead of Taro, who is busy with club activities. A few days later, Taro sees his mother come home and lets out a cry. She was tanned to a brown color and had become so bright that both her appearance and personality were misunderstood. Maki tells Taro, who is confused, to apply a moisturizing cream, saying, "My sunburn marks are itchy." Gradually take the hand of the unsteady son and bring it closer to the private part ….