Reversi and Sexy girl

It sprouts and plays "Reversi" with a beautiful girl. （Is it a cow?）
Three phases of strength. When I won in "HARD", is there any reward?

How to play：
I part from white in black and leave the tile of ones color in turn.
I can put the tile only in the place that can sandwich the tile of the partner between length / the side / slippage by all means on this occasion. The tile of the partner whom I was able to be sandwiched in between is reversed and turns into the color of the person whom I sandwiched.
When I cannot put a tile, I become it in order of a partner successively.
A person with many tiles of ones color is finally a victory.

When I won a game, I can watch a reward image.
Be stirred up lightly if I win in "HARD".