Kazuma and his adventure friends Keith and Dust go to a shop run by succubi who provide male adventurers with much needed relief by giving them erotic dreams. After having a luxurious crab meal and briefly falling asleep in the bath, Kazuma mistakes Darkness for the succubus he chose when she enters the bath to and tries to order her to do dubious things. That is until he discovers Aqua has captured the actual succubus, leading Kazuma to get beaten up by the others while trying to help her escape. The next day, a mobile fortress known as the Destroyer approaches town.