The Plane is a planet created by Airy where the contestants are teleported for the duration of their stay in ONE. Airy tends to keep the contestants within an imaginary border on the top of The Plane, teleporting them back within the area if they attempt to wander out. Airy keeps a bored, deadpan attitude most of the time, and seems to lack in empathy, as, for example, he only responds with a simple "oops, sorry” upon realizing Scenty had fallen to her death before recovering her.