Can’t remember the name

So, I read a manga a few years ago, I believe a shounen ai and fantasy type with old school drawing. It's about a guy who's the reincarnation of a "prietess" who's very important for a group of super human. If I remember correctly, she was the only one that could heal symptoms cause by theirs powers, and I think it had something to do with plants. Anyway, she's reincarnated in a blond guy and is found by her/his past lover, one of the superhuman who has dark hair and don't talk much. Any idea ?