I can only add to all the correct criticisms of other players. The rules are strangely implemented, and while I can live with "no checkmate", maybe even with the "no castling", although annoying, not allowing for pawn promotions is quite unacceptable because it needlessly draws the game out and you need to take care to keep enough material on the board. Most annoying was when it told me "you lose" but didn't say why while I was checkmating with rook and king - maybe some obscure house rule of having to win in X moves?
The AI is an interesting mix of competent (will see short term traps pretty well) and incompetent (may play the rook back and forth for moves on end while you artificially castle your king because there are no direct threats). It certainly needs a difficulty setting because it will probably not be beatable by casual players due to the scarcity of unforced major errors. At the same time it will always play the same move in the same position, even in openings, so once you found a game you win, you will win every time. Until it crashes one move before checkmate which has happened to me a couple of times.
Graphics in the main menu look horrible but the girls in game are okay, switching between 4 or so positions in each stage of undress. But the term "hentai" is in my opinion not applicable.
The "smooth" music is getting on my nerves really fast but that may be different for other players.
In the end I was hoping for a casual strip chess game, but neither part really delivered. Chess was atrocious and the games were taking too long, the strip part isn't worth the effort.