Mahoukarettousei6hd23:40 Min Online

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

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 world begins to fear Tatsuya's "Material Burst" ability, leading to international pressure to isolate him. If you are referring to the 23rd volume