Каруїдзава Кей

She is a girl with a bad attitude who is located at the top of the D class hierarchy. She fights with Kushida for their class' top 2 places. Even though she gives off the impression of someone who is careless, arrogant, and messy, Kei's true self is very logical and astute with a sharp mind. She has remarkable ability to read the environment and the people around her, and makes the correct decision often.