Having graduated from the knight academy with the lowest grades, Lute is assigned to the remote frontier of Boan. Soon after arriving, he is ordered to exterminate a succubus, a monster that has been killing people night after night.
However, instead of defeating the monster, he is given a titjob and has his life force sucked out, leaving Lute resigned to his fate. But for some reason, the succubus takes a liking to him!?
An exhilarating harem story of rising through the ranks is now a comic adaptation of a bishoujo game!