Not all Angels have wings nor do they always have good intentions

Hikari and her brothers, Judai and Haou, were sent down to Earth for protection. After landing a human who was good friends with their dead parents stepped up to take care of them. They go through their lives dealing with the fact their parents died and they have to keep their seceret hidden from the world. They are angels and are the only ones left of their kind. For years the Dark Angels have tried to kill them but fail every time.
Now Hikari starts her first year of High School along with her brothers. Haou being a senior, and Judai being a sophmore. After a few hours, a new guy comes. His name is Kye. He was a quiet and shy boy until Hikari bumped into him in the hallway. From then on, she develops feelings for this newbie. But when she finds out his secret everything changes. Will she be able to help him break through this and love? Or will she die trying to get in touch with his feelings?