Yuudai Saejima

Yuudai Saejima (冴島（さえじま）ユウダイ, Saejima Yūdai) was Minoru and Akane's former high school classmate at Sakurazaka High School. Following the fall of Japan to Magical Beasts, he became the Vice-Commander of the Knights in the human settlement of Messiah and mole for The Alliance.