One day, a large number of people suddenly disappeared in the royal capital. When young King Castio goes out to investigate this occurrence, he comes across the culprit... but the criminal puts a spell on him! To help him out, the king calls the wizard O'Feuille to his castle, along with Prince Volks and his loyal retainer Nios. Together, they're determined to solve this strange, fluffy mystery full of cats, swords and magic! (Source: Tokyopop) Included one-shot: Henkyou no Mahoutsukai (Wizard of the Borderlands)

Ou to Neko no Himitsu was published in English as The Treasure of the King and the Cat by Tokyopop under the Love x Love imprint on May 4, 2021.