Ashinaka High School

is a large educational institute that stretches across an entire island just off the coast of Tokyo Metropolis, not that far away from Shizume City.

Localization
The school is located on a remote island off the coast of Tokyo Metropolis, accessible only by a unique train system, in which a series of trains transport people from the mainland to the island directly beneath a large bridge. Transportation is only open to students using PDA's and lacking one results in the inability to enter or exit the island.