Yamada Jiro is a twenty-one year old Japanese-American who, on a whim, travels with his best friend, Dexter, to his father's native country of Japan. After a mishap with their hotel reservations??and losing their money and luggage??Jiro finds himself facing uncertainty and the unknown when Dexter is kidnapped by an urban legend.

Armed with a cell phone app, which he got from a man dressed in purple at a game center, Jiro must seek out and banish the restless spirits that have been plaguing the Shinjuku district. He is aided in his new quest by Natsumi, his old friend and schoolmate, who is employed by the Bureau of Occult Affairs.

The Bureau's job is to keep otherworldly threats at bay while maintaining a low profile. To Jiro's surprise, they also have a connection to him and his family, a legacy that goes back generations. Long ago, Onmyoji??ancient sorcerers of immense power??protected Japan under the direct orders of the Emperor. Now, the Bureau is the least-respected branch of Japan's government and a dumping ground for embarrassing employees. There hasn't been an active onmyoji in Tokyo for over a decade, and a modern one armed with a cell phone doesn't exactly inspire the most confidence.

Jiro may not have wanted this life, but he has little choice but to trust the Bureau and their good intentions. Fortunately, he has Natsumi to back him up, who may have more than just friendly feelings for her old friend from America!