Due to attacks by mechanical creatures that suddenly emerged,
humanity is now on the edge of extinction...
In a state-of-the-art fighter named XEX, which converts the pilot's intense emotion
at the time of sexual orgasm into energy, Reika rushes into the core of the enemy force...
During the battle, however, her partner Yui who developed XEX falls into captivity.
Yui is going to undergo hellish sexual disciplines in machines...