Plunderer Vol. 2 by Suu Minazuki

Licht and the gang findthemselves face-to-face with the mysterious Demon of the Abyss, only to findthat it's unlike any creature they've ever seen. With rapidly rotating wings anda body of metal, this unknown flying object begins to wreak havoc on the town,forcing Licht to summon his powers. In the midst of the chaos, a mysteriousfigure appears before Licht, and that person is...yet anotherace?!