“My brother, Fuyuhiko, deserves only the very best! If he’s an ultimate, then that means I have to be an ultimate as well!” Natsumi is an 18 year old girl with blonde hair and olive eyes. She’s the younger sister of Fuyuhiko Kuzuryu, the Ultimate Gangster. She is a Reserve Course member and often bullies Mahiru Koizumi due to jealousy and wanting her to drop out. This often leads to her fighting with Sato, Mahiru’s bestfriend