Humanity is nearly extinct. A perpetual and deadly Rain falls on the Earth. Men known as Junkers plunder goods and artifacts from the ruins of civilization. One such Junker sneaks alone into the most dangerous of all ruins -- a 'Sarcophagus City'. In the center of this dead city, he discovers a pre-War planetarium.

There is an accident on a spaceship heading to earth, causing it to crash into the office of the Prime Minister of Japan. The ministers end up in a state too horrible to look at. To avoid chaos, the alien chooses a girl who happened to be there, and to make ends meet, brainwashed all of mankind.

Tomoya lives on his own with only a day job at a convenience store keeping him afloat. While he really likes eroge, he can't draw, and doesn't know much about business. Still, his dream is to get a job at an eroge studio in hopes of creating what he loves, eroge.