Due to god’s mistake a human was reincarnated into a forest dwelling cat. He begins to live his second life as a cat, but there seems to be something wrong in this world. Despite his circumstances, the protagonist lives happily with his cat family, however, God who notices their mistake and gives him a gift as an apology. That gift is a book of magic that contains all the spells in the world. Perhaps because of his former human nature, the protagonist searches for a transformation spell in the book, and transforms into a standing, walking cat. He is the only walking cat in the world, and when he goes to a town where humans live, a commotion breaks out. And somehow, he becomes a hunter and ascends to the throne? This is the story of the protagonist who became a walking cat, living freely in a different world while getting into trouble.