Mumei is a business student who is a cheerful, gentle soft-spoken girl. She is innocent on the outside but has an air of mystery around her, and there are rumors of her having a hidden, unpredictable side that is more chaotic. She strives for perfection in every subject in her course, performing the best she can. She despises freeloaders and will hunt them down until she is satisfied. She is friendly with everyone, but doesn't have many outside her circle and keeps to herself mostly.