In the bustling world of eighth grade, Kaede shines with energy and cheer, except when romance comes into play. After a chance encounter at a peculiar shop, she acquires a magical cocoa mug with a hidden message promising a love fairy's intervention. Skepticism gives way to curiosity as Kaede follows the instructions, hoping to capture the heart of Yuuki, the popular heartthrob. To her surprise, the mischievous blue Mirumo materializes instead. As the prince of the muglox realm, Mirumo prefers indulging in chocolate and causing chaos over granting wishes. Fleeing from an unwanted engagement with Rirumu, his princess betrothed, Mirumo brings a whirlwind of antics alongside Rirumu, the relentless bounty hunter Yashichi, and a diverse array of muglox characters. With this lively crew disrupting their daily lives, Kaede and her friends are in for a school experience unlike any other.