If you can't pay back the magic... prepare for ruin! Rent, a member of the rising star party Blade of the Skycleaver, has always supported his team from the shadows with his rare Gift, Magic Vault—an ability to loan out magic power to others. But when his level growth lags behind, the party cruelly kicks him out, tossing aside all his loyalty and effort. Enraged by the betrayal, Rent's Gift evolves into Unlimited Magic Vault, unlocking new potential—and summoning a mysterious and adorable support fairy named MP. Now, guided by MP, Rent sets out on a magical debt collection rampage, reclaiming the power he lent out... with interest. Those who used him will soon learn: magic debt is no joke.