The 1st Hierarchical City of Ōkoto is the birthplace of Kagura Mutsuki and serves as the headquarters of the Novus Orbis Librarium. It also homes the rest of the Mutsuki family of the Duodecim. It is situated within Canada. Ōkoto is also called an Integrated City because the integrated headquarters of the Novus Orbis Librarium are located there.