The story centers on 25-year-old theater actor Kana Ashishima and his lover, 30-year-old bus driver Yūki Kawata. The two have enjoyed living together happily in love. One day, Kana awakens to find himself with the body of a child. Kana doesn't know why his body has reverted to a child or how to return to his adult body. The happy couple now find themselves in a fearful situation. Until this moment, the two lovers satisfied one another to their hearts' content, but no matter how they feel now they cannot act on their desires.