Kane, a penniless adventurer, arrives at a village during his travels. There, he witnesses a female swordswoman suddenly attacked by monsters. Kane saves the swordswoman, Kurisu, at the last moment and learns that villagers are being kidnapped by monsters emerging from a dungeon. Kurisu, who leads the village's vigilante group, recognizes his skill with the sword and asks him to defeat the monsters. But upon learning the village's dire financial state—unable to offer sufficient payment—Kane prepares to leave. With no other choice, Kurisu offers Kane her virginity in exchange for restoring peace to the village... Can Kane and Kurisu defeat the monsters awaiting them in the dungeon and save the village?