Izumi's return to the world of High School DxD set countless forces into motion.
The announcement of the grand tournament—spanning multiple worlds—spread like wildfire. From devils to angels, from fallen beings to independent factions, nearly everyone expressed interest in participating.
And honestly?
It was too many people.
Izumi couldn't help but sigh.
"...This is getting out of hand."
After a brief moment of thought, he snapped his fingers and made a quick adjustment.
Within his own world, he constructed an additional massive arena—specifically designated for participants from the DxD world.
The rules remained largely the same:
- Each world would hold its own regional tournament.
- The winning team would earn the right to challenge champions from other worlds.
Originally, there were six worlds involved:
- DanMachi
- KonoSuba
- Honkai
- Type-Moon
- Toaru Majutsu no Index
- No Game No Life
Now, with DxD added, there were seven.
After a moment's consideration, Izumi even selected a group from among his own companions to form an eighth team—balancing the bracket perfectly.
"Eight teams… yeah, that's much cleaner."
After spending some time in the DxD world, Izumi returned to his own domain.
But he wasn't alone.
A number of familiar faces—like Yukinoshita Yukino and others—followed him back, eager to experience this mysterious, ever-expanding world.
And once they arrived…
They were immediately captivated.
In Izumi's world, everything revolved around games.
Conflicts weren't resolved through violence—but through challenges.
And the rewards?
Real power.
To participate, challengers had to register through the Misaka Network, managed by the countless Misaka Sisters.
Once registered, any two parties could agree on a game.
The rules were simple:
If both sides consent, anything could be a match.
Chess. Combat simulations. Strategy games. Even something as absurd as hide-and-seek.
And the stakes?
Abilities. Skills. Powers.
It didn't take long for the newcomers to get hooked.
Take Yukinoshita Yukino, for example.
She challenged a member of the Seafolk from No Game No Life—and won.
Her reward?
An ice-based ability.
Her power skyrocketed instantly.
Meanwhile, Yuigahama Yui managed to win a few quirky matches against less intelligent races, gaining abilities of her own.
Before long, both of them were completely immersed.
"...This is actually fun."
More than fun—it was addictive.
Even Sirzechs Lucifer joined in, seeking out powerful opponents.
…Though he lost.
Badly.
Because despite appearances—
Izumi's world was deep.
...
Standing atop the colossal World Tree, Izumi watched everything unfold with amusement.
"…Alright. That should be enough warm-up."
He snapped his fingers.
His voice echoed across every world.
"Now then… let the celebration begin."
"The tournament officially starts—now!"
"Each world will serve as its own region. Victors may choose their teammates for the final battle."
"Fight. Compete. Entertain me."
"Show me everything you've got!"
The response?
An explosion of cheers.
"OOOOOOOOHHHHHHH!!!"
Participants who had registered were instantly transported to their respective arenas by Alaya and Gaia.
At the same time, live projections of every battlefield appeared across the network.
Spectators could freely switch between matches from different worlds.
The entire multiverse plunged into a state of pure, unrestrained excitement.
Izumi leaned back, observing the battles one by one.
Then—
Something caught his eye.
In the Toaru world's arena…
Accelerator.
"...Wait, seriously?"
Izumi blinked in surprise.
Accelerator had entered the tournament—and her first opponent was a magician.
At first, Izumi assumed she'd struggle.
After all, magic had always been her weakness.
But what he saw instead shocked him.
"She's… handling it?"
Not only that—
She had reached Level 6.
Her once-limited vector control had evolved to the point where she could now reflect even magical attacks.
Behind her, a pair of white wings unfurled.
She looked less like an esper…
…and more like an angel.
Also—
"...So she's actually a girl here. Got it."
And she wasn't alone.
Her team consisted of:
- Takitsubo Rikou
- Shirai Kuroko
- Mugino Shizuri
- Misaka Mikoto
"…How did this group even happen?"
Izumi couldn't help but complain.
With another snap, he summoned Senju Kayo into his arms.
She looked up at him, clearly annoyed.
"Onii-chan, I'm busy right now. Don't just pull me over like that…"
Izumi chuckled and patted her head.
"Quick question—why are they participating?"
Kayo thought for a moment before answering.
"They wanted to represent their world."
"…Also, a lot of others did the same."
She continued:
- Jibril and the Flügel returned to their own region
- Ais Wallenstein joined her world's side
- Eris formed a goddess team
- Even Illyasviel von Einzbern and her group created a team of pseudo-servants and heroic spirits
"…Basically," Kayo sighed,
"your entire harem went back to their original worlds to compete."
Izumi froze.
"…They're that bored?"
Then he muttered:
"…Or are they after my reward?"
He projected their matches into view.
Illya's team was dominating with coordinated Noble Phantasms.
Eris's squad of goddesses was surprisingly competitive.
Everywhere he looked—
His own people were going all out.
Izumi placed a hand on his face.
"…I don't even know what to say anymore."
But deep down—
He was enjoying it.
The chaos.
The competition.
The spectacle.
And thus—
The greatest tournament across countless worlds had truly begun.