The current vice-president of the Kaimei High School Student Council was previously the treasurer. She comes across as carefree and has a tendency to be overly cheerful. Her family is wealthy, so she often tries to solve problems by spending money. While she doesn't see it as boastful, Mimori believes that it's perfectly normal to renovate bathrooms with gold fittings, hold lotteries using solid gold sticks, and decorate walls with gold plating. Despite her extravagant use of funds, Mimomi is still polite and uses keigo in her speech.