Hakka Shoujo

Fumi Koito was raised by an elderly caretaker named Hatoko Natsuyaki, whom he affectionately called "Peppermint Nanny" due to her habit of eating his peppermint candy and breathing into his nose. He now lives alone in his mid-20s as a part-time teacher. One day, a young girl around nine years old appears at his home. She is Hatoko, who, after growing too frail in her old age, consumed a mysterious rejuvenating medicine in excess, causing her to shrink and regain the appearance of a child. She has returned to continue caring for Fumi, though the situation often blurs the lines of who is actually looking after the other.