Hmmm not too sure about underrated but here are some of my favorites that I randomly discovered.
- Aoharu x Machine gun (for laughing)
- Watashitachi no Shiawase na Jikan (for crying)
- Karasugaoka Don't Be Shy (short but sweet!)
Incidentally, I read alot of popular manga/manhwa/manhua. I mean they must be popular for a reason. So you may have alr......