The Royal Diana Academy exclusively accepts individuals with exceptional magical talents. Graduates are highly regarded in their field and may even be employed by the royal family. Spica Virgo aspires to attend the prestigious academy, with the goal of becoming a sorceress as skilled as her idol, Claude Sirius. Claude, an esteemed sorcerer, was once the youngest instructor at the academy before he vanished without explanation. But Spica lacks the necessary experience and connections to gain admission into the academy, slowing her progress in achieving her dream. One day, she meets a black cat with the ability to speak and perform magic. In the hopes of enhancing her skills, she pleads with the feline to take her on as an apprentice and teach her the ways of magic. The cat accepts the offer on the condition that Spica finds a way to break his curse, which transformed him into a cat. Despite the trials ahead, Spica is determined to prove herself as an adept apprentice to the cat.