Amidst the turbulent political climate following WWI and the first Sino-Japanese war, the Japanese are taking a rapidly-increasing economic and political interest in the northern Chinese region of Manchuria. Japan and its Kwangtung Army wish to take over the region from China in order to safeguard their interests from the imposing Soviet Union and the spread of communism. The members of the Sakurai Kikan, a special intelligence agency among the ranks of the Kwangtung Army, must overcome film theft, foreign espionage, the spread of Pan- Asianism, and their most testing trial of all - the Manchurian Incident.
Maya Kumashiro is an uptight teenager who has returned to the Waldstein “Occult Academy” following her father’s death to assume his role as principal. With a hatred of the supernatural, she initially intends to run the school into the ground, but her plans are thrown into chaos when a new teacher, Minoru Abe, descends from the sky. Claiming to be a time agent, Abe informs Maya that he has been sent from the future to prevent the Nostradamus prophecies from coming to pass. With a rift to another dimension due to open at the Waldstein Academy that will lead to aliens conquering the earth, the unlikely pair must locate a mysterious object known as the Nostradamus Key and destroy it before humanity falls prey to the occult once and for all.