Please

Does anyone know the title of this yaoi? It goes like this; (I don't remember the names so i'm gonna call them A and B).

"A" is a chosen one to fight monsters every night that appear from the beach.

Years of fighting the monsters resulting in his hands tainted black and he also seems to not age, until he met a boy, "B".

"B" would deliver food to him because the people of the island are afraid of "A". As "A" and "B" spend more time together, he noticed that his hands are starting to heal and looking normal and he also starting to look more like his age.