Usually I give my thoughts on whatever I've watched, regardless of whether such is warranted or not, so here's to that:
From what I've heard, the visual novel from which this was derived is extremely graphic. Compared to that, this anime was quite tame. There were a good number of fan service scenes, often enough to make me feel uncomfortable (though it should be noted that I get easily uncomfortable with that kind of stuff), but the overall work was relatively mild. The main character of the original work (not counting the sequel), rather than trying to find a way to exploit the titular situation that he's in as a teenage boy, chooses to wholly embrace the identity assigned to him by circumstance and so becomes an entirely different person, subverting the title and making this into more of a rather unconventional shoujo work than anything else. From what I heard this anime was near-universally panned by critics, and probably for good reason, but I liked it. It is to me what is called a "guilty pleasure" anime. Kind of a bubbly, feel-good thingamajig, among other things.
It's from 2006/2012 and 12+1+3 episodes long. The animation is alright, and it has a pretty decent OP/ED.