Isekai Onsen ni Tensei shita Ore no Kounou ga Tondemosugiru

If you're looking for something nice to read at night when you're all alone and feeling in a certain mood, this one isn't it. The bare breasts are largely ignorable especially if you're reading it straight, be prepared to get desensitized real quick.

Boobies aside, the story is very bland, characters don't get a lot of development, and nothing in this story is relatable. Isekai Onsen gives the impression that someone had a funny idea and wanted to execute it for the lolz, and that after it was made, a plot and characters was needed so the most basic cookie cutter ones were dropped in.

On a positive note, watching the protagonist grow as an onsen was very enjoyable in the beginning, and this isn't a long read so if you want to just binge the manga and kill some time, feel free.