The beginning of a manga, these two boys showed up and told this girl that they were her guardian angels. I think it was a magical girl manga, but I'm not 100% sure. I know that there were love triangle elements in it, and the girl got with a boy that had really light blue hair named Mamoru pretty far into the manga. I think the second boy had blonde hair? But I could be wrong. I don't remember anything plot other than that. The artstyle was very cutesy though. Along the lines of, like, Kamichama Karin? where the characters were small and kinda chibi. I think they were maybe in elementary school? But I honestly can't remember.

EDIT: Mamoru and the girl's dynamic was like, they were at each other's throats a lot. Kinda like Natsume and Mikan from Gakuen Alice.