The Beast's Forest is a terrain located in the Nagano Prefecture, Japan. The area is under the control of the Pussycats.
This area is the main setting of the School Trip Arc.
The Beast's Forest, as its namesake implies, consists mostly of trees that form a large, dense forest. There's also a mountain range running right next to it.
The Pussycats have an office located somewhere within the forest. Within the office, there are cabins where visitors can stay, featuring a dining hall, hot springs and dormitories.