Trinity Seven Vol. 14 (manga)

The final battle of the Magic Research Tournament finally arrives, bringing with it an unimaginable outcome! It seems like all's well that ends well, but after the festivities, a mysterious woman attacks the school! Mira, Akio, and Levi intercept her, but she delivers an extremely fierce attack of hellfire against the three. Will the girls of Trinity Seven be able to handle this envoy from the True Demon Lord...?!