I'll take this to mean both underrated (I gave it a rating decently higher than mean/median) and also ones that are not popular.
- Champagne If you've ever thought of reading Bartender but want to try something shorter, this is a good introduction. The ending, while a reasonably common trope, still kind of surprised me.
- Kako and the False Detective Another short read that sticks the landing. I don't know much about mystery/supernatural manga, even including body horror, which this isn't, but it was enjoyable. I liked Kako's character and design, and the plot is good.
- Sleepy Barmaid (ongoing) One of my true favorites. MC lives to the beat of her own drum.
@Duamerthrax @Yareckt I grew tired of it during the farm/milking arc, but in reality it lost any direction well before that.