Hana Lanchester is still 12 years old, but already have a lot of activities even though in her big, luxury mansion. She has many butler and maid but cannot accompany her in her free time, even her parents are too busy and almost never come home and she's very lonely. She's so timid, pure and innocent, but very talented in everything. She loves flowers. One day, you were asked to be her private teacher for common knowledge, but it seems she's already comfortable with you after a time being.