Trinity Seven manga volume 14 features story by Kenji Saito and art by Akinari Nao.

The final fight of the Magic Research Battle finally arrives, bringing with it an unimaginable outcome! It seems all's well that ends well, but after the festivities, a mysterious woman attacks the school! Mira, Akio, and Levi intercept her, but she counters with a rain of hellfire! Will the girls of Trinity Seven be able to handle this envoy of the True Demon Lord...?!