Min - Mahoukarettousei6hd23:40

In this episode, the tension of the escalates as the Magic High School students are drawn into a large-scale military conflict.

This volume further explores the fallout of Tatsuya and Miyuki’s engagement, which was officially announced to the Ten Master Clans to secure their position within the Yotsuba family. MahoukaRettousei6HD23:40 Min

The National Defense Force and the Magic High School students defend against a surprise invasion by the Great Asian Alliance. In this episode, the tension of the escalates

The world begins to fear Tatsuya's "Material Burst" ability, leading to international pressure to isolate him. The world begins to fear Tatsuya's "Material Burst"

Suzune Ichijou questions Tatsuya's emotional state and his seemingly cold efficiency in combat, highlighting the "mental interference" experiments performed on him by the Yotsuba family. Light Novel Volume 23: Isolation Arc

If you are referring to the 23rd volume of the Light Novel, titled the story reaches a critical turning point for the Shiba siblings: