Only in Japan: FPS meets erotic game

What’s the strangest FPS you’ve ever played? Nitro Family? Meh. Oddworld: Stranger’s Wrath? The ammo you use maybe strange, but the game’s premise isn’t that outlandish. How about Love Death 2? Never heard of it, you say? The game is an FPS/Japanese erotic game developed by TEATIME.
How does one combine two unlikely genres? Watch the video after the jump, but take note: it’s rather NSFW.