Can’t remember this manga.

[Yurifan]

I am having trouble remembering this manga. This guy is creating a underground dungeon with some slimes and he saves this girl who is a princess and a saint I believe. She has to stay there due to many political reasons and soon many more girls join the duo including I think a another girl from another country.

 

[MavB_Ver]

Welcome to the lowest rating isekai ever, even in my list

https://mangadex.org/title/22699/hisshou-dungeon-unei-houhou