In Episode 5 of "Metallic Rouge," Naomi discovers Rion's lifeless body, leading to an unexpected encounter with a man from the bus expedition. He claims to know Rouge's whereabouts and offers to guide Naomi there. Meanwhile, Rouge is haunted by an intense vision from her past, in which she sees her brother Jean and a mysterious, masked figure in a lush, sealed environment. This vision evolves into a confusing scene where Rouge observes a woman and her younger self in a dreamlike state, confronting the reality that she is trapped in a dream simulation by a masked abductor who urges her to remain asleep.

As Rouge navigates through various dream sequences involving her family and Sara, glimpses of nectar injections and her familial bonds are interspersed with moments of harmony and discord. The narrative then shifts back to Naomi, now allied with Eden Varock, as they infiltrate an airship and uncover connections to the alien usurpers, the "Junoids." Eden's departure to fulfill his duties as a grave robber marks the transition back to Rouge's struggle within the dream simulation.

Naomi's confrontation with Opera, a member of the Carnival, over Afdal's expulsion sets the stage for the climax of the battle, where Rouge is awakened by the Puppeteer. The episode culminates in an intense showdown between Naomi and Opera, interrupted by Rouge and a mysterious new gladiator ally. By the end of the fight, Rouge and Naomi escape with crucial information.

In the episode's closing moments, Naomi and Rouge—now on Mars—reflect on the enigmatic black gladiator, who is revealed to be Eden, watching them from afar before their departure.