I have! It was so good, I loved it! If you've seen it, you probably noticed that there are no females in it. Absolutely none.
I love the characters, and the story, but I hear the game's story is different, and more logical. It gets kinda confusing when they switch personalities w/o warning, or they switch, but don't switch the eye color. That was how I could tell who was 'there' at the moment.
Have you seen it? My fave character was Sunao, but Yoru was pretty hot. Loved the guy-on-guy, and the morning after.
There's an anime called princess princess, or Hime Hime, with 3 boys who sorta look like Sunao, Sora, and Matsuri, only not as cute, who go to an all boys' school, and have to dress as princesses for the boys to pass. A different storyline alltogether. I didn't like it much, and stopped watching after ep. 3.