The Tranquility Guardians are a MagicalGirl warrior duo consisting of Guardian Starshine and Guardian Moonlight. In their civilian identities as Stella Étoile and Luna Selene, they are eighth grade students at DameAdorabellesAcademy in Havensborough.

The Guardians' true identities are not exactly a closely-guarded secret. Almost everyone at Dame A's knows that Stella and Luna are Starshine and Moonlight. Almost everyone. Somehow, against all reason, PrincessAlice still hasn't figured it out yet. She often laments that Stella and Luna are never around to watch the Guardians fight monsters. Should we tell her...?