I've re-watched this anime 3 times and I keep on coming back. Its my all-time favourite anime and I never get tired of it and have zero complaints. I've been re-watching animes lately and it's been 5 years since I first watched. I have changed my mind about a lot of animes, but this one still gets me giddy and excited.
The story is pretty typical, one main girl character, two guys and a guardian angel. But there's something so fundamentally true about this story. Everyone hides their true self more than most would like to admit, it's about being true to yourself.