In Mahou Senshi Sweet Knights: Heroine Ryoujoku Shirei Episode 1, viewers are introduced to a clandestine subterranean realm named Roa, embroiled in a fierce conflict between Queen Gloria's all-female knight corps and the nefarious forces of the Zerou syndicate. The episode centers on Metzer, a cunning officer of Zerou, who devises a scheme to infiltrate Earth's surface and manipulate the Sweet Knights—two Japanese girls endowed with magical abilities by Queen Gloria to safeguard humanity. Metzer's objective is to identify and exploit the weaknesses of the Sweet Knights, aiming to corrupt and subjugate them to serve Zerou's sinister agenda. The animation vividly portrays the contrast between the mystical underworld and the everyday life on Earth's surface, enhancing the narrative's tension and intrigue.