A Certain Magical Index NT, Vol. 3 (light novel) — Kazuma Kamachi

A star-spangled team up...Gremlin, a belligerent organization fusing magic and science, is operating behind the scenes in Hawaii, developing a plot to take over the American government. As a result, Touma Kamijou, Mikoto Misaka, Accelerator, Shiage Hamazura, Misaka Worst, and Umidori Kuroyoru head to America's fiftieth state under the guidance of Leivinia Birdway, leader of Dawn-Colored Sunlight. But no sooner do they land at New Honolulu International Airport than Gremlin springs a surprise attack on them. Fortunately for Kamijou and company, one man has already clued in to Gremlin's schemes and is trying to take it down himself -- Roberto Catze, the president of the United States!