Mahou Sensou Episode 12 -

The episode features a large-scale confrontation between Wizard Brace and the Ghost Trailers.

Takeshi and Gekkou engage in a final showdown. During the fight, it is revealed that their mother actually asked Bishop to kill Gekkou years ago—a revelation that shatters both brothers' previous understanding of the accident. Mahou Sensou Episode 12

The anime ends without explaining several key mysteries, which are later clarified in the Light Novels: Mahou Sensou Episode 12