The Gold Saints who have obtained qualifications with their god-like abilities have gathered in the Holy Domain, but most of them are still relatively young. Pope Shion summoned the oldest, strongest and highest-status Sagittarius Aiorus and Gemini Saga among the Gold Saints. Shion announced that Sagittarius Aiorus, who is both benevolent and courageous, has become the successor of the Pope, and asked Saga to sincerely cooperate with Aiorus to serve the Holy Domain. Saga's twin brother Garon instigated Saga to kill the newly born goddess Athena and Pope Shion, and take possession of the entire earth. The angry Saga imprisoned Garon in a water prison under the Cape of Slio. After a brush with death, he suddenly found a ray of light deep in the water prison and found the place where Athena had sealed the Trident of Poseidon, the Emperor of the Sea. Garen unsealed the trident, pulled out the trident, entered the undersea temple, and awakened the Emperor of the Sea. After the Sea King designated Julian Solo as his replacement thirteen years later, he fell asleep again. Garen began to recruit sea warriors and sea generals as General Sea Dragon. At the same time, Pandora in Haines Castle inadvertently opened the seal of Athena, and Thanatos, the god of death, and Hypnos, the god of sleep, who had been sleeping for hundreds of years, awakened and predicted that Hades, the king of Hades, would resurrect in Haines Castle and become Pandora's younger brother. Soon, Hades's soul was born in Haines Castle as Pandora's younger brother. All creatures in Haines Castle died for no reason. After that, Pandora began to summon the underworld warriors. The evil side of Saga's human nature began to occupy his mind. One night, Saga climbed up Astrology Mountain and killed the Pope. Just as he was about to raise his sword to assassinate Athena, he was stopped by Aios who came. Aios fled with Athena. Saga pretended to be the Pope and announced Aios's rebellion. He fled out of fear for trying to kill Athena and sent Capricorn. Shura chased Aiolos, who fled to Northern Europe with fatal injuries, and entrusted Athena and the Sagittarius Golden Saint Cloth to Mitsumasa Kido, the world's richest man and chairman of the Japanese Kido Foundation, who was traveling in Northern Europe. Mitsumasa Kido adopted Athena and changed her name to Saori Kido. From then on, he decided to train new young saints to protect Athena, and gathered his 100 illegitimate children scattered around the world in Japan for special training. Except for Hyoga, these children did not know that they were Mitsumasa Kido's sons and thought they were orphans.