The young Bronze Saints are taken by Bear Geki to the Hell Camp, which is full of lethal traps composed of the elements of Cosmo. Those who survive the Camp are elligible to become Silver Saints. Kōga and Sōma must work together to overcome the obstacles, all while Sōma must avoid fellow Saint Argo's hostility and haunting memories of his past.

The young Bronze Saints bravely invade Mars' Babel Tower, and succeed in rescuing the girl he claims to be Athena. She reveals to Kōga that her name is Aria. Sensing a threat approaching, Kōga dispatches Yuna along with Aria to avoid being recaptured, and together, the young Saints try desperately to buy time for their escape by facing the seemingly invincible Leo Mycene. In their darkest hour, a memory of Seiya deep in Kōga's heart brings them hope.

The Bronze Saints arrive to a desert area, in which they meet a young girl from the people of Jamir, called Raki, who at first attacks them. After realizing they are Saints, by tradition connected to the people of Jamir, Raki takes them through a shortcut to avoid the desert areas, only to be greeted by the challenge of Kerberos Dorie, who seeks to capture Aria. Managing to defeat Dorie after a difficult battle, the Bronze Saints resume their journey, bidding farewell to their young benefactor, who later is joined by her mentor, Appendix Kiki, the former apprentice of the legendary Aries Mu, now a young man, who realizes the Bronze Saints are the new embodiment of hope in this era.

Eden sees his own darkness as Aria is constantly being used by Mars without the power to do anything about it, before being confronted by his parents about his destiny for the new world. Accepting whatever punishment that would be suitable for his errors, Eden allows himself to succumb to his darkness. Meanwhile, tormented by her own darkness of being used as an instrument of destruction Aria resolves to use her Light to protect those who need her, in doing so she reaches both Eden and Kouga from their darkness and all reach the Core of Darkness. Aria then along Kouga...

Because of Schiller's Praesepe Underworld Waves, Yuna leaves the earthly plane and finds herself in the deathly Hill to the Land of Spirits. Terrified by the sight of the souls of the deceased and visions of her sordid past, Yuna cowers until the arrival of Kouga, who suffered her same fate, and losing his temper due to Schiller's mockery of Aria's death, Kouga is consumed by the Darkness Cosmo inside him. Managing to calm down Kouga, Yuna engages the Cancer Gold Saint in battle once again, and drawing from her bonds to Aria and her comrades, she finally finds the ...