There's this very sweet manga that I can't remember!!! Its about a ghost girl and she's watching this boy. She has the boys memories erased so he isn't pained by her death. But in his sleep and stuff he remembers her. At the end he finally remembers and they somehow kiss? I REAAAAAALLY would appreciate any help :]

I'm not sure but I think it's an oneshot "Memories of you" .You can find it in the first vol. of Mademoiselle Butterfly .Hope it's what you're looking for 🙂

that's it!!!
thank you sooooo much~!