One year after the defeat of Abzu, peace has returned to the world. However, a new threat rises with the advent of Pallas, an old enemy of Athena. Despite knowing that, Seiya can't find the resolve to kill the young Pallas as she is still an innocent child although she is destined to eventually come after Saori's life. Meanwhile, Kouga, training while still recuperating after his battle against Abzu, meets Subaru, a Steel Saint who is eager to challenge him in order to become a God. However, Kouga refuses to fight him and claims that with the world in peace and his ...

With the Gold Saints protecting Athena and the Silver Saints looking for clues about the new enemies, Koga is instructed by Seiya and Saori to assemble the other Bronze Saints. Followed by Subaru, Koga encounters with Souma at the Palaestra, where he is working as a substitute teacher. However, when the Tertiary Pallasite Loge, a master of spear combat appears at the Palaestra, Koga, Souma, and Subaru must work together to protect the students.

Ryuhou, Souma, and Yuna arrive to a village whose survivors of the Pallasite Halimede's attack are under Shun's protection. Among them is Ray, a child whose brother was also frozen by Halimede and blames Shun for it. Halimede instructs Ray to steal the Andromeda Cloth Stone from Shun with the promise of having his brother return to normal, but when the enemy intends to kill both, Shun brings the power of his cloth to the next level.

Once the saints infiltrate the city, Seiya draws the attention of the enemy allowing Koga and the others to push forward. However, Tarvos appears to challenge Koga to a decisive battle and Ryuhou stays behind to assist him.

The Bronze Saints rescue civilians who were unaffected by Pallas' curse when Koga has an encounter with a young girl, unaware that she is none other than Pallas herself who has sneaked out of her castle. Meanwhile, Saori's body grows weaker due to her Cosmo being drained as Shiryu, Hyoga, and Shun approach the battlefield.

As Koga and his friends approach Pallas' fortress, Mira appears before them again, but Ikki arrives in the nick of time to protect them. After the Pallasite flees, Ikki reveals to the other Bronze Saints that Pallas is not their greatest enemy, but an even greater foe who is manipulating the whole conflict from the shadows.

Ikki fights Aegaeon while Koga, Souma, Yuna, and Shun keep moving onward. During the battle, Ikki and Aegaeon sustain grievous wounds. Meanwhile, the Gold Saints discuss Harbinger's loyalty to Athena since she gave the Athena Cloth to him for safekeeping, telling the Gold Saint that Athena trusts him. At the same time, Titan tries to calm down Pallas as she snaps after a Quaternary Pallasite informs her of Ikki fighting Aegaeon. At the end of the battle, Ikki sacrifices himself to completely defeat Aegaeon and all his fellow Bronze and Gold Saints grieve over his ...

After dealing with Paradox, Gallia turns her attention to Athena and the Gold Saints, easily deflecting all their attacks until she reveals her Photontector. Meanwhile, the other three groups figure out the meaning of their endless running, figuring out that someone has put them into an endless corridor. As Seiya's attacks are easily deflected, and Gallia is about to kill him, Pallas informs her to stand back, with Gallia mocking Pallas for receiving no love in spite of being the Goddess of Love. However, Integra and Paradox combine their Cosmo, and destroy Europa's ...

Accompained only by Seiya and Harbinger, Saori finally comes face to face with Pallas. Titan steps in to protect his master and Harbinger challenges the Pallasite, using Athena's cloth to draw his attention. Treating him as a mere ruffian, Titan is surprised by the true might of the Taurus Saint, who proves himself far more powerful and noble than he claims to be.

After donning his New Gold Cloth, Seiya battles Titan, who questions his loyalty to Athena and the Sagittarius Saint reveals that his drive to follow Saori comes from his feelings for her. Knowing how he feels out of his devotion to Pallas, the Pallasite attacks with all his Cosmo, just to be wounded by Seiya's arrow. Pallas intervenes to protect Titan and Saori then reconciles with her, seeing how she has reformed after assuming her love for him. However, Europa appears and uses the curse laid on the goddesses to drain their Cosmo and pours it on Subaru, who is ...

Seiya is defeated by Saturn before Kouga and his friends also fall before his almighty power, following a desperate battle in which the Bronze Saints are defeated one by one. When all seems lost, Athena gathers the Cosmos of all the other Saints to restore Kouga, who rises again as the ultimate Omega Saint, determined to stop the God of Time once and for all.

After a long and vicious battle, Kouga and his friends convince Saturn to recognize the value of mankind as he regains his lost memories from when he fought by their side as Subaru. The God of Time then takes his leave and while the efforts to rebuild the Sanctuary and Pallasvelda begin, Kouga and Eden embark on a journey together to find their own place in the world as a new era unfolds.