In the near future, a race of bunny people (mostly girls) called Lunarians decide to invade Earth so that they can exterminate all of humanity, as they think of humans as germs. They develop a new technology that allows them to change size at will so that they can wipe out human cities with ease.

You are a Lunarian along with a bunny girl named Reisen, and you are both sent down to invade Earth. You are both on a space colony on the moon waiting to be sent down.

Reisen looks at you with excitement

"Aren't you excited to get rid of those puny humans? They'll be so easy to kill~"