The Kazama family and Etsuko family live in the same apartment.The two families are close, and one day while sitting around the dinner table, Etsuko suggests that they swap mothers.Yumi is reluctant, but her son Takashi and Etsuko's son Riku are interested and have no choice but to agree.Then, during spring break, both families face reality.Etsuko was a mother who abandoned housework and childcare.Yumi, who does not know this, is swallowed up by the young and sexual desire of Riku, who does not know true love.
