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Ooga Miko moves from the countryside to the city to look for her older sister. Soon after arriving, she spots a cat about to fall from a rooftop down into the street below. In saving the cat, she falls from the roof, but later wakes up to find that the cat from before has used one of its nine lives to repay its debt and return her to life! Unfortunately, a cat's life only accounts to a year of life for a human, so Miko must now solve 100 cases in order to regain a full life. A series of strange adventures with animals in human form ensues.

Note: Includes two bonus chapters