that sound so sad. which website did you even read it on?
is it new (only has a few chapters) and based off of vampires? your summary reminded me a bit of it; the one I've read was from manga plus shueisha
is it http://www.mangago.me/read-manga/dororo/ ????
there's also an anime of it.
Dororo is a girl tho but she looks like a guy (she's also a kid) and calls the taller guy (Hyakkimaru, i think) "aniki" which is basically "brother", though, they aren't related.
(spoilers - ish) They hunt down demons to restore Hyakkimaru's body parts and Hyakkimaru's hometown hates him because if he kills the demons for his body parts, the village would be destroyed. Even if it's not this manga/anime, it's still really good and i would recommend it.
http://www.mangago.me/read-manga/dororo_to_hyakkimaru_den/
i think THIS is the better version of it.
Mangago
I think it is a little older
Thats not the one but this one looks really good. I think ill read that one now.
What is the name of this manga? Its about these two brothers one is a lot taller and looks older than the other and the other one looks to be just a kid. The taller brother pretends to be a demon to protect the other one. They both hunt demons. The whole village is scared of demons and hates the taller one while loves the other one thinking he is human but he is not.