Orora High School is a high school located within Tokyo, Japan. It is also the main enrollment for the main characters (Nagisa Shiota, Yugure Kagayaki, Karma Akabane, etc.), and the main setting for Crossover Together.
Orora High School is modeled much like any other Japanese learning establishment. One key difference though is the placement of their lowest class (Class 3-E). The main building has many other add-ons to it though, such as a library, a school pool, and main cafeteria.
While Classes-A through D are at the main building, 3-E was built away from the main campus, about a mile away across the mountain range. The 3-E building is much more like an old school cabin than an actual school, the layout made of wood, unlike its larger counterpart. Much of the 3-E building has smaller versions of its main building counterpart, or lacks aspects altogether.
The school had trouble with bullies, and many reports from the school on such matters had made the establishment at risk of closure. One of these incidents involved one of the students, Rikuto Ikeda, had been bullied to such a degree that he committed suicide. Gakuho Asano was so distraught by this that he made the bullies "gamble their lives away", and it was this incident that birthed the "Ant System".
The school follows a special type of learning curriculum the principal calls the "ant system", in which there's a group of slacker (3-E), and everyone else trying to avoid becoming apart of them (every other class grade level). Ironically, the method only increased the bullying range.