Any recommendations for underrated or unpopular romance manga? Yeah, this may be subjective.

Almost everything on my lists. I read nearly only romance and around 95% of what I read is not popular.

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I really like these romance mangas. I think they aren't are popular as most of the other manga I've read.
Boku no Chikyuu o Mamotte- completed
Lovely Everywhere- completed
Nanoka no Kare - ongoing
Pinocchio- ongoing
Celeste Blue- one shot

True Star (Novel) - my favorite of these, though it's yaoi.

Covered in Cinders - nice and morbid!

Return - I love the art, the story's not too short and not too long, and the plot events are unique.

Slice of Black Chocolate - short, wordless, interesting.

Well, I'm not really into seinen and shounen.

Some of them I've already read or I'm already reading but there are some that I checked out just now since you recommended them. I particularly liked Covered in Cinders. Celeste Blue is also good.

Thanks!!

Maybe it was popular once, but I just quickly thought up Charisma Doll

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"'The lives I've taken will be paid for with my own life.' That's one way to look at it...but it doesn't mean they come back once you die. Lives can also be paid for by the sword; by redeeming yet other lives. That is why 'Hitokiri Battousai' is still alive in the Meiji Era."

don't click this link...

Kuragehime may be fairy popular (?), but I rarely see people talk out it anywhere, it's very good, check it out OP.