The hooded person who followed Shark reveals herself as Luna, and says that Shark can call her an emissary from the moon. Shark replies that she looks like something straight out of a fairy-tale, not that he hates them. Luna says that she doesn't have any rancor against him, but she must face him. They then begin a Duel.
The Duels ends quickly, with Shark defeating Luna in an OTK. After he wins, Shark asks Luna if she is alright; she is impressed that Shark could Summon 3 Xyz Monsters at once during the Duel, and says that she wasn't wrong. Luna reveals she is a Numbers Hunter whose goal is to eliminate the "Numbers", and says that Shark is the only one who can stop Dr. Faker, and for that he needs the power to do so - a "Number". Shark declines, saying that he was already once possessed by a "Number", and that he cannot do so. However, Luna replies that he knows how terrifying a "Number" can be, and that this is just why it would be okay. She further explains that "Numbers" are mirrors that reflect the hearts of the people, and at that time, his heart was full of darkness, but Yuma and Astral freed him from that darkness. She then gives Shark a mysterious card, and says that that's a new power to protect him.
Later, Yuma and the members of the Numbers Club gather in Cathy's house. Everyone is impressed at her mansion. Astral comments that it is much better than Yuma's house. Cathy then tells Yuma that if he marries her, all that would be his, and Kotori doesn't believe she said that and yells at her. Cathy apologies with Cologne, and tells her that she can live there if she wants to. However, she just turns around and says that she likes Yuma's house better, and that she prefers love to money. Tetsuo then asks Cathy what she wanted to show them. She then presses a cat paw-like button, which opens a door leading to a big room, with many researchers and big computers. Cathy explains that as an apology for the trouble she caused, the Numbers Club's headquarters would be established there, where they can look up mysterious phenomenons happening throughout the world, and therefore, locate the "Numbers". While the guys get amazed on the technology and say how Cathy is really put into it, Kotori sarcastically says Cathy is letting her money do the talking, while she replies saying asking if Kotori could do that. Yuma says that finding the "Numbers" is not a game, to which Astral replies saying that yet it was heartening, and advising Yuma to tell the others about the previous day.
Yuma then tells them that Astral told him that now he got three "Numbers", some of his memories have returned. Yuma asked what he remember, and Astral says his enemy is Dr. Faker, who plans on using the hidden powers of the "Numbers" to destroy the Astral World; However, it is linked to this world. So, if the Astral World dies, this one will die as well. Kotori asks if that's for real, and Yuma answers saying that Astral doesn't lie - in fact, he can't lie. Cathy asks what is that hidden power of the "Numbers", but Astral haven't regained that much memory yet. Takashi asks if Dr. Faker knows both worlds are connected, and Cologne says that he brought her to life, but that he is a really scary scientist, and that she wouldn't put it past him. Takashi and Tokunosuke get scared on how he knows about that fact but still wants to destroy the Astral World, and on how a man like that is collecting the "Numbers". Yuma says that they have to get the "Numbers" first to stop Dr. Faker's plans, and Tetsuo then deduces the fate of the world is riding on this. Then, everyone, except for Tokunosuke, gets spirited up and say that they will keep on collecting the "Numbers", and that the Numbers Club will protect the world. Astral then says to himself that thanks to Yuma, it looks as though his destiny is on the move.
Turn 2: Luna
Luna activates the Field Spell Card "Level Denial", which prevents all monsters that have a Level from attacking. She Normal Summons "Moon Magician" (1800/???). Then, she Special Summons "Moon Gardna" (100/???) from her hand as Shark controls two monsters. Luna overlays her two monsters to Xyz Summon "Kachi Kochi Dragon" (2100/1300) in Attack Position. Luna attacks and destroys "Right-Hand Shark" with "Kachi Kochi Dragon" (Shark 4000 → 3400). She activates the effect of "Kachi Kochi Dragon", detaching an Overlay Unit to attack once again in a row, as it destroyed an opponent's monster. "Kachi Kochi Dragon" attacks and destroys "Left-Hand Shark" (Shark 3400 → 2600). Luna Sets a card.
Turn 3: Shark
Shark Special Summons "Right-Hand Shark" from his Graveyard as he controls no monsters. Next, he Special Summons "Left-Hand Shark" from his Graveyard as he controls "Right-Hand Shark", increasing its Level by 1 via its other effect. Shark overlays his two monsters to Xyz Summon "Bahamut Shark (2600/2100). He activates its effect, detaching an Overlay Unit to Special Summon "Black Ray Lancer" (2100/600) from his Extra Deck.[Notes 1] Finally, he activates the Spell Card "Chain Summon", which, as Shark Xyz Summoned 2 Xyz Monsters this turn, Special Summons "Cat Shark" (500/???) from his Extra Deck. Shark activates his face-down "Xyz Drop", attaching itself to "Cat Shark" as an Overlay Unit. Luna activates her face-down "Rank Drop" to destroy all monsters Shark controls that have a Rank, but Shark chains with "Seven Tools of the Bandit", paying 1000 Life Points to negate "Rank Drop" (Shark 2600 → 1600). He activates the effect of "Cat Shark", detaching an Overlay Unit to double the ATK of all Rank 4 or lower Xyz Monsters he controls until the End Phase ("Bahamut Shark" 2600 → 5200, "Black Ray Lancer" 2100 → 4200, "Cat Shark" 500 → 1000). Shark attacks and destroys "Kachi Kochi Dragon" with "Bahamut Shark" and attacks directly with "Black Ray Lancer" and "Cat Shark" (Luna 4000 → 0).
The following cards appeared in this chapter. Cards in italics debuted here.