[redone2002]

I don't know who is translating it on Mangadex, but I hope he does the rest. Prior, I just tried using Google translate, which doesn't work too well.

Kind of spoilery, but from what I could gather, it is established that male pregnancy is just a random occurrence that happens to one and every ten men. Kentaro Hiyama becomes pregnant from a one night stand. Most of the manga is just Kentaro's actions affecting the people around him and trying to deal with prejudice. In the fourth chapter, we are introduced to Aki Seto, a female reporter and the mother of Kentaro's baby. Both Kentaro and Aki do not want to get married, but they do want to raise their baby together. Kentaro gives birth to a boy who they name Kotaro.

In the follow up manga, which takes place three years later, Kentaro and Aki are raising Kotaro together and they also befriend a famous pop star who is pregnant with his girlfriend's baby. This manga is currently ongoing.

Both Kentaro Hiyama's First Pregnancy (ヒヤマケンタロウの妊娠) and Kentaro Hiyama's Pregnancy and Childcare (ヒヤマケンタロウの妊娠　育児編) can be read on Comic DAYS, albeit in Japanese only: https://comic-days.com/