Nicholas Foundation

Nicholas Foundation (ニコラウス財団) is presumably a secret magic-side organization related to Santa Claus. Leivinia Birdway refers to it when she mistook the child Fremea Seivelun's comment that she knows Santa Claus exists as a deliberate reference to the organization.

It is unknown whether the organization has an actual Santa Claus as Leivinia Birdway's reaction implies that the character Santa Claus exists.