Seiya and Shun reach the Second Prison and encounter Cerberus, the three-headed Watchdog of Hell. Sphinx Pharaoh, guardian of the Second Prison, feeds dead people who were greedy, to Cerberus. The beast tries to eat Seiya, but is defeated by both him and Shun. Suddenly, Lyra Orphée, a legendary Silver Saint just as powerful as the Gold Saints, appears. Pharaoh says that Orphée came to the Underworld willingly and serves Hades. Pharaoh uses Balance of Curse with his harp, about to tear out Seiya's heart. But Orphée plays his lyre and attacks with Stringer Nocturne, defeating the Bronze Saints. He then goes to a garden, visiting his beloved Eurydice, confined to a rock. Seiya and Shun, who survived the attack, arrive in the same garden and encounter Eurydice. She asks them to please help Orphée. She explains that back on Earth, Orphée and Eurydice lived as a couple, in love with each other. However, she was killed when she was bitten by a poisonous snake. Heartbroken, Orphée went to the Underworld, pleading with Hades to revive Eurydice's soul back to Earth, playing his lyre. Pandora lets him know that his request was granted, but on one condition: both must not look back, not even once, until they reached the surface. Wanting to keep Orphée in the Underworld to play his lyre for Hades, Pandora has Pharaoh trick Orphée with a mirror, reflecting a light resembling the sun's light. Orphée turned around, but Eurydice's lower body was confined to a rock. He decided to stay with her since then. Eurydice asks Seiya and Shun to take him back to Earth. Orphée ignores Seiya's request for help to defeat Hades, but Pharaoh appears, taking the Athena Cloth. After learning that Pharaoh reveals he is the reason Eurydice is bound to remain in the Underworld, Orphée prepares to fight Pharaoh.

Orphée plays his lyre, causing Pharaoh to drop the Athena Cloth and allowing Seiya to recover it. Pharaoh plays his harp, and one of Orphée's strings breaks. Pharaoh hates Orphée because he replaced him, entertaining Hades and Pandora with his harp. He then prepares his Balance of Curse, but it backfires. Orphée kills Pharaoh while holding the broken string with his teeth, and uses Stringer Nocturne. Realizing his mistake, Orphée says goodbye to Eurydice and takes Seiya and Shun to a secret passage, leading them to Hades' Palace in the Eighth Prison, Giudecca. Meanwhile, Shiryu, Hyoga and Kanon arrive in the Third Prison, were the dead move giant rocks, equivalent of their greed and desires. They encounter the prison's guardian, Golem Rock, but Shiryu, who is able to see again, easily kills him with a perfect Rising Dragon. Another Specter, Troll Ivan, is also easily killed by Hyoga's Diamond Dust before he gets the chance to properly introduce himself. Orphée arrives in Giudecca, with a trunk (where Seiya and Shun are hidden). Pandora opens it and its filled with flowers, with Orphée wanting to give them to Hades. Not trusting him, Pandora thrusts the flowers with her spear, trying to see if there is anyone in there. Just then, Garuda Aiacos, Wyvern Rhadamanthys and Griffin Minos, the three Judges of the Underworld, arrive in Giudecca.

Orphée plays his Death Trip Serenade, making Pandora and the three Judges fall asleep. Before he can attack Hades, Rhadamanthys strikes Orphée, knowing he would betray them. Seiya and Shun emerged from the trunk unscathed and attack the Judge. Hades appears, wearing Shun's pendant, and Hades's face looks exactly like Shun's. Orphée attacks with Stringer Fine, with Hades seemingly destroyed, but it is revealed to be a fake body. Rhadamanthys strikes Orphée's heart, ordering him to awake the other Judges and Pandora. Orphée, dying, tells Seiya to attack them both while he holds Rhadamanthys. Seiya awakens his Eight Sense and attacks with his Meteor of Pegasus. As Orphée dies, he entrusts the Bronze Saints with Athena. Rhadamanthys survives the attack, but Shun begins to act like Hades and his hair turns red. Seiya tries to snap him out of it, but Hades has taken over his body. Rhadamanthys attacks Seiya, defeating him. Both Seiya and Orphée's bodies are taken to the frozen hell in the Eighth Prison, Cocytus, where the dead who have committed crimes against the gods, are buried up to their heads. Pandora and the Judges awaken, and Hades sits on his throne. The Judges find it hard to believe the God of the Underworld used to be a Saint. Hyoga, Shiryu and Kanon arrive at a swamp in the Fourth Prison, guarded by Lycaon Phlegyas. Hyoga and Shiryu are defeated by him, but Kanon kills Phlegyas with his Galaxian Explosion. He takes the raft and the unconscious Saints with him to the Fifth Prison. At the Eighth Prison, Pandora tends to Hades' wounds from her spear, trying to find them in the trunk. She then calls him her younger brother.