The story takes place in a world where—in rare cases—men can conceive and give birth. Kentaro Hiyama, an elite ad man, suddenly finds out one day that he is pregnant. His partner, Aki Seto, never thought she would become a parent, so the two are at first confused by this unexpected event. Challenged by many problems associated with modern pregnancy and childbirth, the two will have to face reality and make the ultimate decision: to have a baby or not.