Nagumo Hajime and his crew had successfully saved his former classmates from the treacherous mythical labyrinth. However, this was just the beginning of their heroes' journey in Tortus as they faced their first significant setback. Despite this obstacle, they pushed forward alongside their new teammate, Kaori Shirasaki, with a unified goal of taking on every labyrinth and discovering a way back home. Amidst their quest, their counterparts on Earth acknowledged their missteps and geared up for the inevitable arrival of a demon army invasion. As the ultimate confrontation approached, old and new adversaries initiated sinister schemes, putting Nagumo in another high-stakes fight for the safety of his loved ones.