Receiving grave news of wandering humans entering a mystical land Gensokyo, and being slaughtered in the process by unreal forces. The anti-Metal Gear non-profit organization Philanthropy investigates what kind of threats are amongst mankind. Sending in their finest agent, Solid Snake. What Snake comes upon is a bunch of... Flying girls that shoot lasers and thousand of bullets.

A Touhou Story. Kagyua and Mokou fall in love with the Metal Gear series and decide to play a real life game of "Metal gear" with the rest of the touhou cast. Can Solid Kagyua stop Liquid Mokou from launching her "Metal Gear" and destroying Gensokyo?