Isekai no Toilet de Dai wo Suru.

It is said that the average human spends three years of their life on the toilet. So when Yotaro, a man who values his throne time, is reincarnated in another world, he dedicates himself to searching for the perfect privy. Dragon-scale seats and slimes for wiping are only the tip of the turd in this crude commode... er, comedy!

(Source: Seven Seas Entertainment)