 Two students enter a pact via an application to the school administrative staff and exchanging the rings attached to the hilts of their swords.This is seen as a deep commitment much like the "marriage" that it symbolizes, and there have been occasions when sisters-in-arms are called "husband", "wife", or some variation thereof.When the pact between sisters-in-arms is dissolved, the number of stars they had gained up until that point is divided equally among them.