Sumire Ichigaya's got it tough. She's drowning in debt, surrounded by noisy neighbors, fighting for discount supermarket meals, and working a dead-end job exterminating space pests leftover from a failed alien invasion. It seems like things just can't get any worse--until she's abducted by aliens and wakes up with a monstrous new arm and a foul-mouthed voice in her head!

Sumire's new life as a member of the Raiden Corporation is underway! But if she's going to survive her new life as a space vermin exterminator, she's sure got a lot to learn--like how to control her mysterious transformation ability and how not to drive her new roommate crazy!