Kaede, an upbeat eighth-grader, is completely timid when it comes to romance. After purchasing a vibrant cocoa mug at a strange shop, she finds an inscription revealing that reading a wish aloud while adding hot cocoa summons a love fairy, or muglox, to fulfill desires. Skeptical yet intrigued, Kaede wishes to date Yuuki, the popular boy at school, and the tiny blue Mirumo instantly appears. However, Mirumo is more interested in eating sweets and causing chaos than helping her. As the prince of the muglox world, Mirumo fled his realm to avoid an arranged marriage with Princess Rirumu. Now, Rirumu, bounty hunter Yashichi, and a chaotic army of muglox are in pursuit, turning Kaede’s everyday school life into a whirlwind of adorable trouble.