Kane, a wandering adventurer, is walking down a road toward town when suddenly, everything goes dark. He’s stuffed into a bag and kidnapped. When he was pulled out of the bag, a young dragon girl stood before him. She is the princess of the nearby Dragon Castle, who had come incognito to play in the human world's town. However, she had been scolded by a maid from the castle who came looking for her, making it difficult for her to return to the castle obediently. Though she wants to return to the castle, she fears the maid's anger. The princess begged Kane to accompany her and apologize together to the angry maid, so he decided to go with her. Well, when opportunity knocks, Kane seized it—first by capturing the princess of Dragon Castle. The merciless punishment of the monster girls begins.