Maki, who was angry at her husband's cheating, decided to take her son Keita and go to her sister's house for a while. However, her older sister Ayano and her son Takahiro have a forbidden relationship, and Keita, who has been inspired by looking into it, asks Maki for her relationship. Such two sets of mother and child are under one roof ... At some point, the relationship is jumbled, and the forbidden mother-child swap full of lust begins! !
