Ages ago, the goddess Athena was served by fighters called Saints who channeled the power of the Cosmos within them. Now a youth named Seiya has trained to become a Saint himself by earning the mystical Cloth of Pegasus. He is joined by other Saints with Cloths of their own to fight for Athena.
When Miro’s life is at stake under Surt’s malicious scheme, there emerges the strongest Gold Saint of Athena – Gemini Saga! Meanwhile, Helena, whom Deathmask secretly fancies, falls for the ferocious God Warrior Fafner’s offer for “medical treatment”.
With Yuna, Souma, and Ryuhou leaving ahead to the Sanctuary, Koga and Subaru look for Haruto in Japan and find, much to their surprise, that he is now a singer in a rock band. Haruto rejects Koga's pleas to return, claiming that to him, his music is now more important than being a Saint. However, during a concert, Haruto watches Koga and Subaru being attacked by some Pallasites, and to protect his friends and his fans, he dons his brand new Wolf Cloth to join the battle.
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 Soma 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, Soma, and Subaru must work together to protect the students.
Learning of Souma's defeat, Eden leaves the Sanctuary in order to find Aria himself. He eventually manages to track down Aria, who is accompanied by Kouga and Yuna. After easily defeating Yuna, Eden and Kouga have their long awaited fight. However, the Orion Bronze Saint easily dominates the battle despite Kouga's best efforts. Not wanting to see her friend hurt, Aria allows Eden to take her away.
Eden takes Aria away, and Aquila Yuna and Pegasus Kōga resume their journey, demoralized by their failure to protect their friend. Along the way, Yuna and Kōga separate, meanwhile Eden and Aria reminisce about the happy days they shared during their childhood. Kōga later meets a young man who first mocks his weakness, luring the teen Saint into a fight. Kōga later realizes the man to be the owner of an immense Cosmo, and turns out to be Cygnus Hyōga, one of the legendary Saints who protected Earth from great menaces many years ago. Hyōga manages to teach Kōga that to reach the true potential of his Cosmo, he must first believe in himself. After learning Hyōga's lesson, Kōga rejoins Yuna and both resume their way with renewed resolve.
Aiolia had defeated Frodi after his Gold Cloth had evolved into a new form. However, a mysterious pattern reappeared on his body again, and he collapses to the ground. Lyfia runs around to find help for Aiolia, but soon collapses herself, too. When she wakes up, she finds herself with a young boy and Aries Mu, who carries the Cloth Box. Meanwhile, a guy was heading alone to the fighting arena in Asgard. His name was Taurus Aldebaran, and he too, was trying to find the reason to why he was given another life.