The Irregular at Magic High School, Vol. 27 (light novel) - Sudden Change Arc

As Minoru and the parasites continue their infectious schemes, Tatsuya is hard at work on his typeless magic—the sealing orb. If perfected, it could make capturing parasites a breeze. Meanwhile, the war between the Great Asian Alliance and the New Soviet Union comes to a head as the Soviets prepare to invade Japan. Mobilized to intercept them are Masaki Ichijou and Shinkurou Kichijouji. How will these two fare against their sworn enemies?! One after another, strategic-class magicians converge on the Land of the Rising Sun!