Quinn, princess of a demon tribe, has survived a near-fatal wound and is now seeking revenge against Princess Mitsuki. While Mitsuki misses her childhood friend Anna, a detective named Hibiki arrives and declares herself Mitsuki’s rival. The situation turns dire when Quinn sends a monster named Kraja, who manages to trap the Fair Knights (Fair Icicle and Fair Riot), leaving them unable to fight. Now, Mitsuki and Hibiki—despite their mutual dislike—must decide if they can join forces to defeat Quinn and Kraja.