The Kazama and Etsuko families live in the same apartment building. The two families are close as families... One day, while gathered around the dining table, Etsuko suggested swapping mothers. Yumi hesitated, but her son Takashi and Etsuko's son Riku became interested and had no choice but to agree. And when spring break arrived, the two families faced reality. Etsuko was a mother who abandoned housework and childcare. Yumi, who didn't know that, was swallowed up by Riku's young, sexual desires, who didn't know true love...
