Yoko, who has a college student son, was weeding the garden when her son's friend Tohru came to visit. However, her son was away for a week at a club training camp. Having no other choice, Tohru offered to help Yoko weed the garden. As the two of them were weeding, Tohru, a college student with a strong sexual appetite, was captivated by Yoko's beauty, which didn't seem to match her age...