A black cat wakes up human and spends the entire episode trying to help her family without breaking character, which means a lot of stumbling around on two legs and forgetting how doors work. The comedy lands because it never punches down at the cat, it's genuinely delighted by her confusion, not mocking it. What makes this hit is that her love for her family is the entire engine of the story, and the show trusts that's enough without needing conflict or stakes to justify the runtime.
Shiro is a black cat who adores her family with every fiber of her being. She longs to help them whenever they face need or trouble, but as just a cat there is little she can do. Unable to offer real assistance as a pet, she makes a desperate wish under the moonlight for the chance to truly help those she loves. When morning arrives, the impossible happens: Shiro wakes up as a human girl. Adapted from a manga by Takada Emi, this single-episode OVA from 1991 blends comedy, fantasy and slice of life.