​In the depths of a hidden magical world named Roa, a fierce battle rages on between the all-female knight corps led by Queen Gloria and the monstrous troops of the evil syndicate Zerou. Enter Metzer, an intelligent and young Zerou officer who receives special permission to execute his groundbreaking plan. Transferred to Earth’s surface in secret, Metzer’s mission is to earn the trust of the Sweet Knights, two Japanese girls endowed with the power to protect humanity from Zerou’s monsters. With his newfound knowledge of their vulnerabilities, Metzer skillfully employs his creatures to conquer, capture, and hypnotize the Sweet Knights, transforming them into Zerou’s obedient sex slaves. Little do they realize that Metzer harbors even greater aspirations…​

​Experience the depths of a subterranean world in “Roa: The Battle Within.” The all-female knight corps of Queen Gloria clash against the monstrous troop of evil syndicate Zerou in a war that has taken hold of the magical realm. Metzer, a young and brilliant officer of the Zerou, proposes a new plan to his high command, which earns him official approval. His mission: to gain the trust of the Sweet Knights, two Japanese girls bestowed with the power to protect the Earth’s surface from the syndicate’s monsters. Unbeknownst to the Sweet Knights, Metzer has sinister intentions. Watch as he uses his monsters to defeat, kidnap, and brainwash the Sweet Knights into becoming sex slaves devoted to Zerou’s cause. Will Metzer’s grand ambitions succeed or will unforeseen challenges arise? Dive deep into this captivating tale of power, desire, and deceit.​