The former wearer of the Pegasus Bronze Cloth, Seiya is revered as a Legendary Saint in the millieu of Omega. Having defended Athena in the past from powerful enemies, Seiya once again takes flight in his mission to protect Athena assisted by the Sagittarius Gold Cloth.
During the period of peace that followed after the Holy War against Hades, the God of War Mars and his Martians army invade the Earth, until he confronted Athena and the Legendary Bronze Saints. Now officially wearing the Sagittarius Gold Cloth, Seiya takes up to the challenge with his companions to defend love and peace once more.
During their first encounter, a dark cosmo-charged meteor mysteriously fell on the battlefield, momentarily ending the threat posed by Mars. The meteor brought a mysterious power which resonated with Athena's Cloth. The collision caused a shift change in all of the Saints cloth, enabling them the ability to use the seven elements and compacting them into small gems called Cloth Stones. A new legend of the Saints had begun.
Unfortunately for the Saints, the meteor also granted Mars and his army with the new power. With his new armor "Galaxy" and the ability to control the element of Darkness, Mars and his warriors return to face Athena and the Saints again. Mars attacked Sanctuary in hopes of trying to capture Athena, who was raising the infant who would later become Pegasus Kōga. He manages to inflict Athena with the "dark wound", before Seiya intervened.
Seiya engaged the God of War in combat, clashing on equal ground in terms of power. Finally, with the arrival of the rest of the Legendary Bronze Saints, Seiya manages to win and seal Mars. But it was later revealed that Seiya had leaped into the darkness Mars contained within himself, as to become a last resort when Mars could no longer harbor it. Because of the power of Darkness Mars had attained, most of the Saints who had faced him acquired "dark wounds", preventing whoever marked with be consumed by darkness if burning their Cosmo, effectively preventing them from fighting. When Seiya is released from the shackles of darkness on Mars, he is shown to have several of these scattered across his body.
During the brief period of peace that came after the sealing of Mars, Seiya is shown to have disappeared. Thirteen years later, Athena delivers the Pegasus Cloth to Kouga. Mars finally breaks free from his seal and goes to capture an unprotected Athena. Seiya, in turn, uses his Cosmo to teach Kouga, the Pegasus Ryu Sei Ken and explains to him more about Cosmos.
While attempting to rescue Aria and Athena in Sanctuary, Leo Mycenae and Mars are able to defeat all the young Saints. About to end Kouga's life, Mars is stopped by his surprise of the brief return of Seiya's spirit, who soon notices that his power is nearly extinguished. With his last bit of strength, Seiya proclaims that he will not let the young saints' perish, and the two rivals clash. The resulting signature attacks from the two creates an extremely large explosion, with Seiya looking at Kouga before being consumed by its force. With Seiya's intervention, the young Bronze Saints escape with their lives from the Tower of Babel.
Seiya is then seen again after the destruction of the Wind Ruin. Using his last remnants of Cosmo, Seiya manages to send a message by the Pegasus Constellation to Kouga and the other Bronze Saints telling them that "To you, I entrust Athena". After the message, Medea relates to Mars that Seiya's Cosmo has completely vanished.
The "Final" battle to save the Earth led the Bronze Saints to Mars, where Kōga finds himself possessed by Abzu, the God of Darkness. In turn, it is revealed that Seiya was being imprisoned for an indeterminate time in the depths of the red star, with his body covered and chained in Brands of Darkness. Mars regretted having been consumed by the darkness, protected Seiya so that Abzu wouldn't possess him. He had kept Seiya alive to serve as a last resort, to continue the fight against the darkness in the case where was no longer able to contain it.
With the cosmo of Aquila Yuna, Lionet Sōma, Dragon Ryuho, Wolf Haruto and Orion Eden, combined with the remnants of Athena's scepter, the chains binding Seiya are broken. Seiya hastens back to the surface and prevents Abzu from killing Saori. With the help of Yuna, the only Bronze Saint to be standing still, they finally managed to release the Pegasus Saint from Abzu's possession.
Unfortunately, the respite is short-lived. Abzu fled the scene into an enormous black hole and kidnapped Saori. Seiya transfers the Sagittarius Gold Cloth to Kōga who is the only Saint still untouched by the darkness, to leap into Abzu's darkness and put an end to the battle once and for all. When Koga manages to free Athena, he throws her to the ground before Abzu can retake her. Finally, once Kōga had defeated Abzu, a purifiying rain of light pours throughout Earth, cleansing people with Brands of Darkness finally having protected the love and peace in the world once more.
The manga is an adaptation of the second season of the anime, the return of Mars here has no other purpose than to introduce the character Kōga. But if the first season is not addressed in the manga, it does not mean that the events associated (defeat Mars and Abzu) have not taken place, quite the contrary.
After the struggle against Abzu, a new danger threatens Athena. Pallas , Athena's younger sister and Goddess of Love, is about to make her comeback on Earth. On Athena's orders, Seiya must kill Pallas, armed with the infamous Golden Dagger of a previous Gold Saint. However, he meets a young girl who begins to shed tears, ready to accept her fatal sentence. Torn between his duty and his feelings, the Gold Saint can not resolve to stain his hands with the blood of a child. It is at this point where the Pallasite Titan appears to prevent Pallas' death. After a brief scuffle, the latter carries the child, leaving Seiya alone with his remorse. His hesitation for Athena and her Saints has lead to a new war. Once back at the Sanctuary, Seiya reported to Athena to apologize for not killing her sister Pallas. Still feeling remorse by what just happened, Seiya was convinced that he was no longer worthy to be a Gold Saint. Saori managed to comfort him and asked him to forgive her for having faced such an experience. The Saint and his Goddess' cause of concern did not waver as they stand to close to each other. Pleased, Seiya renews his oath and promises that he will protect Saori, which is a promise that the He reiterates shortly after to Kōga, during his visit to the Sanctuary.
Some time later, while Pallasites attack people around the world, Athena dreams to go to end the conflict that Seiya previously refused. Finally, Athena summoned her Saints to prepare for the coming war. During her speech, Pallas' braclet begins to drain Athena's life force, making her fall. Seiya acts quickly to catch her. Shortly after the death of Genbu , Seiya vows that he will not hesitate any longer, and will finally join in the war against Pallas. Not long after Seiya travels to a now besieged Pallasbelda and meets with the other bronze Saints. Now with Athena on site , the legendary Saint comes easily to rout the enemy . Once the danger has passed , Seiya stays with Saori and assists the Bronze Saints to the location of the hideout of Pallas: the fortress of Pallasbelda.
Prior to storming the premises. Seiya carried the weakened Athena back to her resting chambers, then vows that he will not hesitate any longer, and takes the Golden Dagger from it's box, determined to use it. Seiya then joined Pallas Belda , accompanied by some Silver Saints and Steel Saints. There, he and his friends found Kōga then opens the way to destroying the city gate . Nevertheless, many Pallasites soldiers stand in the way of the Saints. Seiya decides to create a diversion to allow his companions forward.
Thereafter, the Saint is working to win the Pallas Belda, decimating enemies in his path. During his advance , he meets Eden , about to start a fight against Europa . After a brief exchange of blows,Europa scares Seiya and talk a bit with the son of Mars before resuming his journey. Some time later,Seiya comes to rescue Kōga and friends, who were threatened by Titan and Pallas. Seiya tries to shoot Pallas unchecking a golden arrow but Titan stop Golden Arrow with His Holly Sword . The shot misses despite all his new target thanks to the intervention of Koga . After the departure of Pallas and Titan , Seiya goes his way with his companions.
Following the destruction of the Gate of Time, Seiya enters Pallas' castle with Athena and other Saints. Along the way, the group encounters Europa, who takes perverse pleasure in ridiculing the Saints and Athena. Angered, Seiya attacks but his friends bring him back to reason. After the departure of the Pallasite, the Saints are faced with four roads, one leading to Pallas. The group decides to split up to take different paths. Seiya chooses to stay with the remaining Gold Saints to protect Saori. In doing so, he takes the road Vanahemir.
Gallia interrupts the two Gemini Saints and strikes a lethal blow to Paradox. After dealing with Paradox, Gallia turns her attention to Athena and the Gold Saints, easily deflecting all their attacks until she is forced to reveal her Chronotector by Aries Kiki's Stardust Revolution. Meanwhile, the other three groups figure out the meaning of the endless path, figuring that someone has trapped them in. As Seiya's attacks are easily deflected, Gallia is about to kill Him, but pallas informs her to stand back, with Gallia coldly responding with her loyalty belonging to someone else. However, Integra and Paradox combine their Cosmo, and destroy Europa's trick with the Another Dimension, allowing the other groups to reach the battlefield. However, Paradox succumbs to her wounds and dies in Integra's arms, fulfilling her destiny as the Gemini Gold Saint
Athena and the remaining Gold saints make to Pallas' Chamber where they are intercepted by Great Sword Hyperion . His power is so great that the combined efforts of Seiya,Harbinger and Shiryu are easily cast aside, leaving visible damage to their cloths. Fudo, Kiki, and Shiryu decide to face off against Hyperion, allowing Athena, Seiya, and Harbinger to move forward. Hyperion's Destructiontector and Destruction Slash greatsword proves to be too powerful for the three Gold Saints' attacks on their own. In a final show of strength, they combine their Cosmo knowing that they may perish because of the vast cosmo needed to unleash the forbidden attack: Athena Exclamation. The Saints and Pallasites including, Shiryu's son Ryuho throughout Pallasvelda react to the outpouring of Cosmo, and as the Destruction Slash greatsword is destroyed, the three Gold Saints' Cosmos vanish along with their bodies. Seiya is shown to be visibly shaken, shedding tears after feeling his fellow Saint's cosmo dissapear. He then reaffirms that he must protect Athena while they head towards Pallas, even at the cost of his own life.
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