Luna's plan to free Ancient Fairy Dragon is hampered when the Minus Staff she was carrying gets reversed, causing Torunka to blurt out their plans. Regulus manages to destroy Zeman, who is simultaneously destroyed by Leo in the real world. This returns Torunka to his normal age, but doesn't free Ancient Fairy or the minused spirits. Devack uses those spirits to summon his Earthbound Immortal, Cusillu, and Leo barely manages to survive the attack. Torunka and Regulus return Luna to the real world, where she takes over for Leo and starts to get the better of Cusillu.
As Luna and Torunka manage to find Regulus, Luna notices he has a Minus Staff stuck in his leg, causing him to hear the opposite of what Luna says and become distrustful of her. Luna manages to steal one of the foot soldier's Minus Staffs to negate the one on Regulus, and when he notices she is a Signer, he decides to help them. Devack has summoned Zeman the Ape King, and Leo is struggling to make a comeback, but he notices Power Tool Dragon is trying to protect him. Back in the Spirit Realm, Zeman's spirit uses the power of the minused monsters he captured to start turning the sun minus, causing the surroundings to revert and Torunka and Luna to become younger.
As Luna reaches a town in the Spirit Realm, she notices that its inhabitants are running frightened, and gravity is behaving oddly. She is discovered by a group of monkey soldiers, who imprison her card spirits in stone tablets with minus levels. She is rescued by a young mage named Torunka, who decides to help Luna find Regulus, the servant Ancient Fairy Dragon spoke of. Meanwhile, Leo continues his duel with Devack, managing to summon his Power Tool Dragon to gain the lead.
The Dark Signers show up to taunt the Signers following Yusei's duel with Roman. Demak introduces himself and reveals he is in possession of Ancient Fairy Dragon and challenges Luna to come get it. Roman announces that their duels will take place at the four safety switches of Old Momentum. Whilst chasing after them, Jack discovers that one of the Dark Signers is Carly, who tells him to find her if he wants to know what happened. Back at Martha's house, the children are blaming themselves for her sacrifice, but Yusei promises the children he will be able to bring everyone back after defeating the Dark Signers, even though he is uncertain if that will actually happen.
As Roman prepares for his Earthbound Immortal summoning, Yusei tries his best to postpone it and Martha and Trudge hurry to save the children. However, Roman then speeds up the process and is able to summon his Earthbound Immortal, Uru. Thankfully, Jack arrives on time and forms a barrier around the children to stop their souls being sacrificed. Roman then reveals that not only was he an assistant to Yusei's father, but is also Goodwin's brother and the one responsible for the Zero Reverse incident. Yusei manages to deflect an attack from Uru's attack, but it hits a building Taka, Martha and Trudge were hiding in.