A Whisker Away (2020)

Miyo Sasaki is a weird second-year junior high student, who falls in love with her classmate Kento Hinode. Muge tries to make Kento notice her every day, but all in vain. Nevertheless, while carrying a secret she can tell no one, Muge continues to pursue Kento. Muge discovers a magic mask that allows her to transform into a cat, however, there is also a probability that she might never become human again, if she continues using the mask.