The backstory, for what it's worth:
Newly wed to Shunsuke, eldest son of the historied Tsubakikoji family, Reiko suffers the loss of her husband the very next day. Under the cruel and unceasing mockery of the aristocrats, Reiko's common-born blood sets to boil. Clutching the rose Shunsuke gave her to her bosom, Reiko issues a defiant challenge to the house. "I am the widow of the eldest son of the Tsubakikoji family. This house is mine!" ...This is the elegant art of feminine conflict.
A Japanese (what else) game that illustrates the problem of violence against women in computer games. That's okay, though. They're both women, so it's kind of hawt. Wait until they discover spanking.
At the bottom right of the splash screen there's a difficulty slider; below it, a Start Game button will light up. From there, click the button on the right and swipe your mouse across your opponent's face to deliver a blow. Sometimes you can get in a second shot, but you've got to be quick. Defend yourself (somewhat) by clicking on the left button and dragging across to turn your face away from the return slap.
Warning: Music and sound effects.