The 15th Hierarchical City of Torifune (第十五階層都市「トリフネ」 Dai-Jūgo Kaisō Toshi “Torifune”), also known as the Academy City (学園都市 Gakuen Toshi), is a Hierarchical City where the Military Academy is located.
The Military Academy is the whole Torifune. Although the school is extremely large, Torifune is actually one of the smallest Hierarchical Cities. It has a population in the tens of thousands, with approximately 80% of its population related directly to the school.
Like other Hierarchical Cities, it is divided into levels with a Control Organization Branch at the top. The second level contains a single port, which is the only way to enter or exit. This is because students are expected to live entirely within the city except for one break a year, and to help keep the many students and officials living there safe from terrorist attacks and other dangers. The third level contains the security and management departments, the fourth level contains junior high through college facilities, the fifth level contains pre-school to elementary, the sixth level is the business district, the seventh level contains the dormitories, and level eight through ten are off limits to students. Their gear-type elevators are more powerful and run better than the ones in most Hierarchical Cities, due to the Control Organization managing the city. The city is more organized and well-planned than others such as Kagutsuchi as a result.
The lower levels of the city, that remain unknown to the public, are both hazardous and varied. In the eighth level, thick toxic fogs of magic element are known to drift around, while there is a small mansion located somewhere within the area. Another area within the academy contains a beach. One of the more exotic places in the academy is a large desert where the Guardian resides.
Most of the management and defense of the city is handled primarily by the student council and students.