Do you mean in Japanese? It was released in 2013 so the tankoubon's out-of-stock from online stores I buy from but you can certainly get the ebook from Renta! https://renta.papy.co.jp/renta/sc/frm/item/160654/
It's not licensed in English based on https://www.mangaupdates.com/series.html?id=82685
There's also no fan translation based from the same site.
plz help. Has anyone read hiyama kentouro first pregnancy ?
I cant buy it or find it anywhere ;-; hdbshddud someone share plzzzzzzz ┗( T﹏T )┛