In the Spirit World, Luna enters the Minus World in search of Regulus. She gets chased down by an army of monkey spirits commanded by [[Monkey King Zeman|King Zeman]], who is Demak's Dark Synchro Monster. The monkey army captures "[[Kuribon]]," "[[Sunny Pixie]]," and "[[Sunlight Unicorn]]", she evades them though with the help of a spirit named Toreka[[Torunka]]. Luna eventually finds Regulus at Pojar Forest and tells to the Lion of the promise long ago made to Ancient Fairy. However, because of the [[Cursed Needle]] in its ankle, he understands her on the opposite way, thus after a chase, Luna is finally able to dispose of the Needle and convince the White Lion of her righteous intentions by showing her [[Mark of the Dragon]]. After that Regulus, Luna, and Toreka set off to Zeman's castle. They are able to get inside by tricking Zeman into thinking that Luna is a servant of Zeman and has caught Regulus. She also tells Zeman to curse both Regulus and Ancient Fairy Dragon in order to minus Ancient Fairy completely. Zeman falls for this and is about to release her.

However, Zeman finds out they were trying to trick him and orders his army to attack them. Still, he's killed by Regulus at the same moment [[Leo]] defeats him in the real world. As then Demak summons his [[Earthbound Immortal - Cusillu]], attacking Leo, who whitstands the attack. Then, Torunka sends Luna back to the real world, where she takes on her brothers' place. Demak then attepts to use Ancient Fairy Dragon against Luna, but she forces him to sacrifice it to save his Earthbound Immortal from being destroyed, which allows her to summon her Dragon to her side of the field. Once done this [[Regulus]] appears and brakes the Dragons´ chains freeing it at last. Luna then proceeds to use both Ancient Fairy Dragon and Power Tool Dragon to destroy Cusillu and defeat Demak.