i remember i read this manga years ago about a girl who befriends a boy that has had everyone he cares about die. she falls off a cliff when hanging out with him, and doesnt want to hurt him, so she wishes to be immortal in a sense. i remember some sort of snake god grants her this, but in exchange she cant leave the island she lives on. whenever she dies, she becomes a ghost and tries to get back in her body. does anyone know the name of the manga

maybe this....Shindere Shoujo to Kodoku na Shinigami

wow that was fast... and its the right manga!!! thank you!!