The Floating Library is an area accessible from the door at the end of the Dark Forest.
The Floating Library, as its name states, is a large library consisting of various floating islands. The islands are connected by various staircases and bridges that allow each to be traversed. The background of the area depicts a map of the world.
Within the library is a brown door surrounded by two lamps that leads to a room with a blonde NPC inside. Interacting with this NPC will give Sometsuki the Magician effect. Additionally, there is a red magic circle on the ground that can be activated by finding five different candles scattered throughout the Floating Library. Once all five candles are found and lit, Sometsuki can return to the room with the magic circle and interact with its center to obtain the "hexe" Window Type.