To Princess Rosemarie, anyone showing negative emotions appears to have the head of a beast. So she rushes to marry Prince Claudio, whose features remain human. But she finds out the reason too late: he has a real beast head, and it's her fault!

15-year-old Anti Kythera can’t even use the most basic of magic skills. Then, at a ceremony to find her magical talent, she discovers that she has Gearcraft, a skill that allows her to make and control golden gears!