He's ExpectingHe's Expecting.

He's Expecting, also known as Kentaro Hiyama's First Pregnancy (Japanese: ヒヤマケンタロウの妊娠, Hepburn: Hiyama Kentarō no Ninshin; lit. 'The Pregnancy of Kentarō Hiyama'), is a Japanese manga series written and illustrated by Eri Sakai. It is set in a world where males are able to become pregnant; the story follows Kentaro Hiyama, an elite ad salaryman who discovers he is pregnant. Kentaro Hiyama's First Pregnancy was serialized in Kodansha's bimonthly (at the time) Be Love Magazine from August 2012 to November 2012 and was collected into a single tankōbon volume.