A girl without magic trying to become a witch finds her master in a talking black cat cursed to stay feline unless someone kisses him. The show builds its entire premise on mutual desperation dressed up as a deal, which means every lesson is actually foreplay, every magical failure is a setup for him to catch her, every moment suspended between "this is ridiculous" and "wait, is this actually happening." The romance doesn't arrive later, it's baked into the setup so deep that watching her stumble through spellwork while he corrects her has teeth to it, a constant low hum of tension that never lets the comedy be just comedy.

Spica Virgo dreams of attending the prestigious Royal Diana Academy, but there's one problem: she can't cast a single spell. Without a master to vouch for her, admission is impossible. Broke and desperate, Spica's life changes when a black cat suddenly appears with the ability to talk and wield magic. She pleads with him to become her teacher, and he agrees on one condition: she must help lift the curse that keeps him in feline form. Their arrangement stays a secret, and the key to undoing the curse turns out to involve a kiss. Spica is set on proving she deserves his guidance, whatever hardships lie ahead. The story is a fantasy set around a magic school, pairing a clumsy young witch with her unusual four-legged mentor.