Tatsuya Shiba and his sister Miyuki travel to Yokohama for the Thesis Competition, a showcase of magical research nearly as prestigious as the Nine Schools Competition. Underneath the academic surface, Zhou Gongjin is working out of the city's Chinatown to set an invasion in motion. Erika Chiba's older brother Toshikazu, a police inspector, is already intercepting smuggled landings at the port, and First High student Chiaki Hirakawa is drawn into the hacking end of the plot. This manga adapts the Yokohama Disturbance arc of the Mahouka light novels.