In Episode 1 of Castle Fantasia: Seima Taisen (also known as Castle Fantasia: The Sacred War), the story introduces the 200-year-long war between the Ingera Holy Kingdom and the Lushiera Republic. The Ingera Holy Kingdom, which worships the Light God, enforces a strict hierarchical system, while the Lushiera Republic seeks to break free from this oppressive order. The war has reached a stalemate, with both sides losing sight of their original reasons for fighting. Amidst this chaos, a young hero named Hewie, commander of the Seventh Holy Knight Corps, emerges as a key figure who could change the course of the war .
Hewie is known for his laid-back attitude and lack of discipline, earning him nicknames like "lazybones" and "salary thief." However, beneath his carefree exterior lies a brilliant strategist with exceptional combat skills. Despite his reputation, Hewie is deeply committed to protecting his comrades and the innocent. The episode follows Hewie and his team as they navigate the complexities of the war, facing both external enemies and internal conflicts within their ranks.