The fifth Tokugawa Shogun, known as the Dog Shogun, has somehow been reincarnated in modern times as the cat Tunayoshi. Together with Yoshiyasu, a chamberlain from that time who has also been reincarnated, he stirs up trouble! Although he may look cute and weak, Tunayoshi is filled with a strong sense of justice. Although he is sometimes bullied because of his small body, he is extremely active thanks to the mysterious spiritual power of a cat demon that suddenly appears!