Dear Space

In the future, humanity has become able to colonize other planets and colonies... but humanity has depleted most of Earth's natural resources.

The Earth Alliance possesses a fleet of gigantic mining spaceships, the Planet Cracker, which destroy other asteroids to harvest resources to sustain humanity.

At the request of his lover, Klau, protagonist Euclid is dispatched to repair the tram (train), the onboard transportation for the Planet Cracker Stone Village, which operates on the outer edge of the solar system.

However, aboard the ship, humans, living creatures, and machines have been exposed to a mysterious substance called EX Cells, contaminating them...

Monsters driven by self-replication and an aggressive instinct await... Klau's lover, Klau, has become the first "Mother" to be infected with EX Cells.

Mother controls a select few women who have undergone unique transformations, calling them "Monmusu."

And in the protagonist's hands is the only weapon capable of firing a Wave Motion Gun capable of sedating and neutralizing EX Cells: the "Prototype Wave Motion Gun Type R"...

Will the protagonist be able to defeat Mother and the Monster Girls and restore their sanity?

Or will he be defeated by the Monster Girls and violated...?

If he loses, he'll be violated by them! The adventure set on a giant spaceship begins now!