After moving from the countryside to the city, the protagonist witnesses a cat teetering on the edge of a rooftop. Their heroic attempt to rescue the feline results in a fall from the roof. Miraculously, the protagonist comes to and discovers that the cat had sacrificed one of its lives to resuscitate them. However, this act of kindness comes with a catch. As a human life equates to a mere year of a cat's lifespan, the protagonist must solve one hundred cases to reclaim their full life. What follows are a string of peculiar exploits that involve humanized animals.
