Irina, a female knight, accidentally killed a dragon and got a magical crest on her lower abdomen as a reward. This crest gives her dragon-like strength but also makes people around her very lustful. One night, she unintentionally turned all the men at her workplace, including the king and prince, into her “hole brothers,” and she fled.
Now, Irina’s goal is to kill another dragon to get rid of the crest’s effects. She travels with Fafnir, a talking crest, who helps her. They reach a port town where Fafnir senses another dragon. Irina searches for this dragon, hoping to solve her problem without succumbing to the lustful effects of her crest.​