A mysterious dungeon suddenly appears in the city, and many people begin to go missing near its perimeter.
To uncover the truth and rescue those who have disappeared, the city’s justice-protecting transforming heroine — Holy Illusion Masked Princess, Aurora Crystal — enters the dungeon together with her partner, Kuroe.
During their initial investigation, Crystal discovers a strange core machine. After destroying it, a hologram of a young girl appears.
The girl introduces herself as Mashi.She explains to Crystal how the dungeon came to exist and states that all core machines must be destroyed, and the core terminal at the deepest level must be eliminated, or the true mastermind cannot be defeated.
Mashi pleads for Crystal to stop Droug’s ambitions, and Crystal accepts without hesitation.
Guided by Mashi, Crystal destroys each scattered core machine one by one, gradually opening the path to the deepest part of the dungeon.
Along the way, conversations with Mashi reveal her past, and Crystal slowly uncovers the full story behind the incident.
Finally, understanding everything that has led to this crisis, Crystal prepares to confront the true mastermind lurking at the bottom of the dungeon…
