is a Japanese manga series written and illustrated by . It has been serialized on Kodansha's Magazine Pocket website and app since March 2022. An anime television series adaptation, produced by Liden Films, is set to premiere in April 2026.
Spica Virgo is a budding witch who admires Claude Sirius, a skilled wizard and teacher who mysteriously vanished one day. However, due to her clumsiness and lack of skills, she feels it is difficult to fulfill her dream of entering Royal Diana Academy, a prestigious magic school where Claude was once a teacher. One day, she encounters a black cat. She is surprised that the cat can talk and asks it for help in entering the academy. After learning that the cat was formerly human but was cursed to have this form, Spica aims to undo the curse. She learns that she has "Rebirth Magic", which gives her the power of regeneration, and that she can undo the curse by kissing the cat's butt. She does so reluctantly, leading the cat to reveal itself to be Claude. With this, Spica enters the academy, with Claude becoming her teacher, with Claude still maintaining a cat form as Spica's magic remains too weak to lift the curse fully.
The Classroom of a Black Cat and a Witch, written and illustrated by , began serialization in Kodansha's Magazine Pocket website and app on March 16, 2022. Kodansha publishes the series in English on their K Manga service.
An anime television series adaptation was announced on August 5, 2025. The series will be produced by Liden Films and directed by Naoyuki Tatsuwa, with Midori Gotà  handling series composition, Takayuki Onoda designing the characters, and R.O.N composing the music. It is set to premiere on April 12, 2026, on the Agaru Anime programming block on all JNN affiliates, including CBC Television and TBS, and will run for two consecutive cours. The opening theme song is "Cusp", performed by Asca, and the ending theme song is "Tune Up", performed by Spira Spica. Crunchyroll will stream the series. Medialink licensed the series.