The Fujima family and the Etsuko family live in the same apartment building. The two families are close... One day, while gathered around the dining table, Etsuko suggested they swap mothers. Yumi hesitated, but her son Takashi and Etsuko's son Riku were eager to agree, leaving them with no choice but to accept. Then came the spring break, and both families had to face reality. Yuko was a mother who abandoned housework and child-rearing. Not knowing this, Yumi was swallowed by Riku's young, sexual desires...
