This game appears to be a rip-off of the early Gals Panic games, but with less eating up the screen. As with those games, you have to draw lines across the board in order to reveal pictures of a girl, while avoiding the monster and keeping your status in the green so that the picture doesn't change. As you progress through the stages, the girl removes clothes.
Note: None of us can read Taiwanese, so we're aware that "Silk" isn't the real title of the game according to the title screen. As such, any translation of the title screen would be appreciated so that we have the game's proper title.