Fumi Koito used to be raised by an old housekeeper named Hatoko Natsuyaki. He would call her "Peppermint Nanny" because she would eat his leftover peppermint candy drops—because he hates how they taste—then breathe into his nose because he likes the smell. Now Fumi is in his mid-20's and living on his own as a cram school teacher. One day a little...