Injuu Kangoku ~Dirty Prison Ship~

In search of resources, humanity sets off into space, the final frontier.
A crew of 14 aboard the spaceship Settler has just finished it's mission,
and is on the way back to Earth.
However, engine trouble leads the crew to board a passing ship...

From there, an unknown life form starts to take control of the crew's reason,
and turns them into lewd beasts.
Can you and the heroines escape alive?

[From DLsite English]