Trinity Seven: The Seven Magicians (Manga) Vol 31 (Mature)

Now that Akio has joined up with Mira’s forces, the maguses and their allies are ready to launch a massive counterattack. Mira leads a veritable “army of humanity” against the enemy stronghold tower known as Tendou, but to succeed, they must deal with the transcendent demons called Error Grades! Can Mira and Akio, united by their bonds, win this decisive battle?! Yen Press
(W) Kenji Saitou (A/Ca) Nao Akinari