The bastard son of a rich aristocrat is hellbent on seeking revenge ever since his father abandoned him and his mother. He decides to teach his father a lesson by destroying what he treasures the most, his two daughters. He infiltrates their prestigious school with a magical time-freezing device he received from a witch — and proceeds to repeatedly rape his half-sisters, leaving them confused, helpless, and begging for mercy.

During the feudal era war develops on several kingdoms and territories, and Ryuuto leads one of the sides until one day his political enemies decide to set up a trap and send him to hunt a demon—which turns out to be a succubus known for killing several men already. The succubus falls in love with him—or at least with his lower part and energy—and decides to help him succeed in his military quest.

In a devastated world overrun by monstrous bugs and ravaged by outlaws, there's only one person to call when you really need a job done right: Honoka. With a sixth sense for danger, sword skills second to none, and a smart-aleck A.I. tank by the name of Bogie, she's ready to tackle any job and solve any problem for her clients. But while crossing the desert one night, she finds a young man alone in the wasteland. It's the first step of a journey that will challenge even Honoka's amazing skills to their very limit!