Vampire Kingdom.
One of the first sets of Other Dimension coordinates that Tenjo Hikari obtained back then, during the era of the Seven Stars, when Teacher Daitokuji dispatched the "Seven Stars" Duelists under his control to Duel Tenjo Hikari and the others.
At that time, the "Vampire Fraulein," one of the Seven Stars, took part in a tag Duel against Tenjo Hikari and Marufuji Ryo.
Even though Tenjo Hikari's side won that Duel, the process was actually quite grueling; if it had been a one-on-one Duel, neither Tenjo Hikari nor Marufuji Ryo in those days would have been able to defeat the Vampire Fraulein so easily on their own.
Still, a win is a win. In the end, the Seven Stars Duels were won by them, the students, so the Vampires had no grounds to object.
Ultimately, Tenjo Hikari obtained the powerful "Kuriboh" Vampire Fraulein who had always been helping him and had "saved" him many times.
Anyway, the combination of Vampire Fraulein and Vampire Vamp, paired with a Fusion Dragon or Netherworld Dragon strategy, worked quite well in Tenjo Hikari's hands—especially Vampire Fraulein, who was a lifesaver in many Duels.
Even though Tenjo Hikari now has "Arcana Force XIV - Temperance," whose protection covers a much wider range, that doesn't mean Vampire Fraulein has lost her value. After all, who knows when he might suddenly need her again?
You never know; nobody can say for sure.
But in any case, Tenjo Hikari still doesn't have that many Zombie-Type Monsters, and if possible, he really does enjoy letting Netherworld Dragon come out and stretch its legs more often. Tenjo Hikari can feel that the Spirits he brought out from the S Dimension all basically enjoy the feeling of being on the field.
Not because they're warlike, but simply because they want to get some fresh air.
Tenjo Hikari stood before the city gate, gazing at the gloomy towers, and knocked lightly on the door.
There didn't seem to be any Guards.
Or maybe at this time of day, most of the Spirits in this Dimension simply weren't around?
Tenjo Hikari had no idea.
After he finished knocking, Tenjo Hikari stood off to the side, mulling over his past experiences.
After losing to Tenjo Hikari and the others, Vampire Fraulein handed over the Card that was her "true body," but because she was the current Manager of the Vampire Kingdom and had to remain to guard the empire, she didn't follow Tenjo Hikari.
At the time, the Vampires had already told them one thing.
The matter of the Spirit Dimension collapsing.
Before Teacher Daitokuji told Tenjo Hikari and the others about this, the Vampires had actually already sounded the alarm.
For some reason, some existence shattered the Spirit Dimension. As for the reason and purpose behind that mastermind's actions, no one knew, and no one discovered anything.
But in any case, because of that incident, some of the relatively "higher-ranked" Spirits in the Spirit Dimension began conducting related investigations.
Some were preparing to grow stronger and gather power for revenge; others, truly worried that this existence threatened life itself, went searching for the source.
The true sovereign of the Vampire Kingdom, the "Voivode," whom the Vampire Spirits called the "Grand Duke," vanished under such circumstances.
At the time, the Vampires warned Tenjo Hikari and the others that Dimension Travel was extremely dangerous, that humanity was absolutely not prepared, and that one day they would pay the price.
A year has passed. Although Tenjo Hikari hasn't felt any particular "price," he has increasingly sensed that the Human World he's in has been growing more and more different from the "GX" he remembers.
Not only because this world is fused with Yu-Gi-Oh! A5, but also because of something more deeply rooted in the world's very "foundation."
Namely, the Spirit Dimension.
As if both Spirits and humans tacitly agreed that Dimension Travel would inevitably bring a "price."
All the top-tier Spirits and top-tier Human Duelists seem to know that there is some existence that has torn apart the Spirit World, now watching all "life" like a tiger stalking its prey, seeking to obliterate everything.
But what exactly is it?
No one knows.
Even the Three Sages, even Teacher Daitokuji, are investigating, searching for traces.
They don't even know what that so-called mastermind actually is.
Is it a single individual existence?
Or some terrifying faction?
No one knows.
And according to Vampire Fraulein, the true ruler of the Vampire Kingdom, that "Voivode" was one of the Spirits who left their world to seek answers.
But clearly—
The Voivode has, to this day, shown no sign of life, effectively having disappeared completely.
The city gate slowly opened. A number of bats flew out through the gate, circled a few times in the air, then swooped around Tenjo Hikari a couple of times. After spiraling a bit, these bats settled in the middle of the gate, and before long, a crowd of "people" gradually took shape.
Some wore Wizard Hats, some were dressed in Noble's Formal Attire, and others held Blood-red Staffs. A large group of Vampire Spirits appeared before Tenjo Hikari, scrutinizing him as if trying to see right through him.
Plenty of Vampire Sorcerers, Vampire Dukes, and Vampire Scarlet Scourges had shown up.
And after these Vampires landed, at last, a figure familiar to Tenjo Hikari slowly came into view, sweeping him with a few glances.
"So it's you, little purple cutie—eh? Why did you switch to a blue uniform?" The last bat turned into a languid noblewoman, looking like some sheltered young lady from the inner chambers.
Camilla.