Set in a world where the men are the ones who get pregnant. Kentaro Hiyama works at an advertising agency while his romantic partner Aki Seto is a freelance writer and editor. She prioritizes her career and ignores her parents' pressure to marry. One day, Hiyama learns that he is pregnant, surprising both himself and Seto. Neither had expected to become parents. As Hiyama endures increasing difficulties with his pregnancy, he and Seto must decide whether or not to have their baby.