Mao is the halfbeast princess of the land of Bestia with only a pair of animallike ears and fangs to identify her true heritage and is also the true leader of the mercenary knighthood Weiss Ritter. She left EndEarth for Earth in search of Zero and inadvertently brought Souma and Kureha back to her homeworld. Her soul blade named the quotBeast King Sword Lion King039s Flame Dancequot possesses properties of fire and is Souma039s preferred blade but not his Ultimate. Throughout the later episodes it is implied that Souma and Mao have feelings for each other though nothing culminates until the end.