And so, from AbZHz101 on SB, we have the beginning of the Back on Earth side materials.

Back on Earth 1:

Kai reached for the mystery card. The one that Naoki had seemed to discover and change his deck around in the time that he had come from Miyagi Academy, "Eradicator, Vowing Saber Dragon Яeverse." He'd never seen a Narukami with that sort of power. That match... Had all come down to a misplay and Naoki's lack of a Trigger. Had Naoki remembered to trigger Blade Hang Dracokid's skill and instead chosen to only use Saber's ability once... Aichi had had three cards in hand.

From trigger checks they had all been reasonably certain that Aichi hadn't had a Perfect Guard remaining. Which meant that the maximum shield size in his hand was 30,000. Coupled with Alfred's 11,000 power, that made a defensive wall of 41,000. 46,000 if Naoki had chosen instead to leave one activation of Sabre off the board and used Bladehang's ability instead. But, that would have given Naoki's Sabre a 11,000 base+2,000 for the Cross Ride+10,000 for the Break Ride+3,000 for Bladehang's Skill+ 10,000 from Sabre's skill. 36,000 power... 2 Critical. That would need 2 Triggers on its own, but at the same time, it was a bit unlikely that Aichi would have three 10,000 shields in his hand. Aichi was good, but there were only twelve total in the deck. Far too low a probability. As was actually the case. As they knew from the post match... Aichi only had 25,000 in defense in his hand. Between that and his remaining Rearguard, it put his defensive power at 41,000. Normally enough for a Break Ride, but it would have been close.

Once Naoki used Sabre and it's new skill all that prediction went out the window. Even 33,000 power was nothing to sneeze at and would have taken his entire hand to keep down. And with Drive Checks, it was slightly anomalous that Naoki hadn't pulled a Trigger, though that might be due to his Units' reluctance. Though not something that was insurmountable from what Kai could see. Naoki had had two paths to victory on his turn. Going for the guaranteed hit and trying for the Critical Trigger, which even if he got a trigger was still only a one in four chance of success due to his Reargaurd formation (which he had done)... Or predict that Aichi had a less than maximum defense and use Bladehang. At that point, he could attack Aichi's remaining rearguard and reduce him by 5,000 shield. Something that even with a maximum shield hand, Aichi could ill afford. Then even if Aichi had had 30,000 shield, Naoki would have only needed one trigger of any kind to pass (which in post match they knew he wouldn't have needed) and he would have already had the critical to kill. Aichi would have lost.

As Kai's fingers were about the brush the mysterious card, it and Naoki's deck began to shine with a paradoxically black light. Kai jerked his hand back in surprise as the image of the card and the name changed. Still Grade 3... Still a Narukami. Still a Thunder Dragon. Still one that Kai had never seen before! This one... "Яogue Eradicator, Vowing Double Blade Dragon." That odd character was still on it. What had... Everyone had turned to stare at the changed card. Gently he picked up the card and offered it to Misaki.

"How about this one?" he asked.

She shook her head. "No, I've never seen this one before either." Her gaze narrowed. "But, I can look them both up," she said turning back to the counter and the computer on it. She opened the bookmarked card registry and typed in "Eradicator, Vowing Saber Яeverse." Nothing. There was no card like that in the registry. So... What had been going on? Had someone given Naoki a fake card? But that still didn't explain why he had been acting so strange.

She glared over to the new mystery card, lying guiltily on the table. She clicked the Search engine again and typed in the new name.

...This one was there. "Яogue Eradicator, Vowing Double Blade Dragon," she began reading. "Skills... It's another Cross-Ride Unit. So it could combine Cross Ride and Break Ride like Naoki did in that game. For the Limit Break, it can Lock it's own units like the Яeverse Unit Naoki was using before. Only... It costs less in Counterblast because it also gains a permanent 2000 power reduction rather than adding power, and doing so retires one Unit in the opponent's front row and locks one unit in their back row. It also has another Skill that makes it a 'Link Joker' Unit." She glanced at the others. "I haven't heard of that clan... Have any of you?"

Everyone shook their heads, frowns and confusion growing longer with each moment. "Odd... His flavor text refers to the Link Joker too... Let's see what his Lore says..." She clicked open the Lore page and the first thing that came up was a blurb on Eradicators. Below that was... Her breath caught and she turned the monitor so that everyone else could read it.

"Who are the Яogues?

These warriors are born from those who had been thought to have lost themselves to the Void. Though they still use the power of Lock, they seem to fight on they side of Cray. Those who were of Cray's stock consider themselves both part of their original clan and Link Joker, while those who came from the invaders still seem to call themselves Link Joker and Void Agents, though perhaps not invaders anymore. The leader of this rebellious faction is a malfunctioning Promethium unit, whom the faction claims holds deep insight not only into the nature of the Void itself, but also into the fate of Cray and the fate of the invasion and what comes after. So far, the invaders have made no direct movements against these "new" players in the planetary conflict... Perhaps in curiosity, perhaps because they hold no quarrel. For the resistance of Cray, dark times have led to uneasy acceptance to the return of lost comrades baring strange allies. Only time will tell if this was wise, or sheltering a viper under the shirt."

Kai, Miwa, and Aichi felt their hearts stop for a moment. The look on Misaki's ashen face told them that she felt the same. Cray was being invaded. And the fight was spilling over into their own world. Were these Invaders the force that Cray had needed the VF Circuit to band against?

"Uh... What's wrong?" Naoki asked looking at the others, not understanding. Shingo also didn't know, but hadn't wanted to say anything.

"This isn't over," Kai muttered.

"Mmm?" Shingo asked, looking at the legendary fighter.

"Look at the first sentence," Miwa stated darkly. "That and the fact that they are a group means that there are more. And not only that, but they 'are born from those who had been thought to have lost themselves to the Void...' There are more cards like that Яeverse Unit out there."

"And the fact that those cards can affect their owners means that the fight for Cray... Has now crossed over to earth. And we just found out," Kai added in.

"What? But Cray's just an imaginary place for the game setting!" Shingo stated in disbelief. "It's not on any star chart! And the large number of celestial bodies would tear it apart with all the gravity. And magic isn't real!"

"Cray's very real," Aichi murmured, staring back at his cards. His friends. The Liberators. "Kai, Misaki, and I have all been there. That was what the VF Circuit was all about."

"So then..." Naoki asked walking over to the Яogue card. Kai looked back at Naoki, thinking about the fight again. If he was being controlled, maybe he didn't forget about Blade Hang's ability. Or rather the real Naoki hadn't, but had made the fake misplay by "forgetting." He then studied the Яogue card. Compared to the brief glimpses he had gotten while the game was going on... The left vambrace was different, more specifically the design was the same and still the same as the right, but the colors were different. Where the right vambrace was yellow/gold the left was an opal white. Where the lightning bolts were black on the right, on the left they were red. Not only that, but descending from the belt were a pair of cuirasses, with the same color as the changed vambrace's base color. And from the positioning of the right leg, you could see a small strip of black leather wrapping around just above the knee, locking the cuirass in place. The trail of red behind the ring was longer, almost as if... were the ring spinning it had sped up significantly. Finally, the swords were positioned differently. Before, they were up crossed in front of the dragon's body in a guard. Now they were extended away from the body. Combined with the knowledge of what was going on and the new card's skills and flavor text... It was almost like Saber Яeverse had been trying to protect itself and only itself, especially from acknowledging whatever had changed him; while the Яogue... He made a formation in his mind. Each sword shielding one of his Rearguard. Accepting everything to save them.

"We're all going to have to keep our guards up. This is only the beginning," Aichi told the group. Everyone could only nod.

"Be careful around that card," Kai added. When Naoki looked at him he sighed and continued. "Whomever gave you the Яeversed version likely knows that you've lost. If they have access to Cray... Well we simply don't know what they can do in that case, but they've hit Vowing before. They might go after him... and you again."

Miwa smirked self-disparagingly. "Looks like things are about to get interesting, wouldn't you say guys?"

Unseen to anyone, when the Яeversed Unit had transformed into a Яogue, another Unit had slid itself into the display case as if it belonged there. The card depicted what might be mistaken for a man rushing forward, a duster kicking up in the wind behind him to convey speed. Silver hair still short enough that it was still somewhat spikey even in motion. A pair of sunglasses covered the eyes, and the face had a knowing smirk. The figure had one outstretched hand from which red light seemed to be emanating.

===CARD INFO BELOW===

The Яogue, Trent Blackmore

A smile like a stiletto, accompanies a deal with the devil.
[AUTO]: When this unit intercepts, if you have a Vanguard with "Яogue" in its name and there are at least two Locked units on the field, this unit gains +10,000 shield until the end of that battle.
Power: 9000; Critical: 1; Clan: Link Joker
Grade: 2; Shield: 5,000; Cyberoid

Яogue Eradicator, Vowing Double Blade Dragon
You want my Loyalty, Devil? ...Then to protect them from the Link Joker, I'll damn myself with both hands!
[ACT] (VC) [Limit Break 4] [Counter Blast 1]: You may Lock two Rearguard Units that you control. If you do, Retire one opponent Front Row Rearguard and Lock one Back Row Rearguard. This unit also gains "[CONT] (VC): Reduce this Unit's power by 2000."
[CONT] (VC): If your soul contains a unit with "Vowing" in its name, this unit gets +2000 power.
[CONT] (VC/RC): This Unit is also Link Joker.
Power: 11000; Critical: 1: Clan: Narukami
Grade: 3; Thunder Dragon

Yeah, Lot more rule and Card Game heavy on this side. But it's kinda how the characters on Vanguard!Earth can interact with Vanguard Units, through the game.