Who asked him to play Yu-Gi-Oh!

Chapter 1597 One Wave
Red-Eyes Dark Iron Dragon Unit 2, summoned!

"Of course, the second Red-Eyes Dark Iron Dragon summoned by Atem Dragon King also has zero attack power, but its monster effect is still effective!" Kujo said. "Therefore, I will activate the effect of Red-Eyes Dark Iron Dragon II!"
Once per turn, you can Special Summon a Dragon-Type monster from your hand or Graveyard.

I'm Special Summoning 'Electric Tail Dragon' from the Graveyard once again!

The Electric Tail Dragon, which had repeatedly entered the graveyard, was pulled back onto the field, its body crackling with transparent electricity.

[Electric Tail Dragon, Attack Power 2500]

Jonouchi felt he was almost becoming numb.

Summoning such a high-level monster so casually makes me look a bit foolish, considering I just used up half my hand to summon a Red-Eyes Black Dragon.
However, to be fair, even though he used up three cards, he was able to summon a high-level ace like Red-Eyes Black Dragon in the first round, which made him think he was already one of the best duelists.

But now, in comparison, the other side can suddenly unleash so many high-level monsters in the blink of an eye; their speed is terrifying.
No, we can't afford to lose our composure.

Jonouchi shook his head, patted his cheeks, and forced himself to cheer up.

He, Katsuya Jonouchi, is a man who has even faced the wrath of the gods. Back then, with just a little more willpower, he almost defeated the Winged Dragon of Ra, who was known as the strongest phantom god.

Forget all the fancy stuff, there's nothing to be afraid of.

Kujo: "Then I stacked two Level 10 'Red-Eyes Dark Iron Dragons' on top of each other, creating a stacking network of monsters, and Xyz Summoned them—"

—Rank Ten! Super Heavy Turret Train - Gustav Super Cannon!!!

A long railway track was laid down with a whooshing sound in the vortex of overlapping light. The pitch-black train clattered down along the track, quickly deformed upon landing, and the cannon snapped into place, its sights locked on the target.

[Super Heavy Turret Train - Gustav Super Cannon, Attack Power 3000]

Jonouchi: "Whoa, another incredible thing has appeared. What is this now?"

"Don't rush, I'll let you die knowing why!" Kujo laughed arrogantly. "It's not over yet. Saint Chrono Dragon King Atem Dragon King cannot attack during the turn its effect is activated, so neither of my two Saint Chrono Dragon Kings can attack this turn. But that's alright!"

As he spoke, the Extra Deck popped open with a click, and Kujo drew another Xyz Monster card from the Extra Deck and revealed it.

"Although 'Thunder Knight Gaia Dragon Rider' is a Rank 7 Xyz Monster, it can be stacked on a Rank 5 or Rank 6 Xyz Monster on your field to directly perform a Rank-Up Summon!"

As he spoke, he flicked his finger, and another card appeared behind the one he had just revealed. It turned out that he had shown two Gaia Dragon Riders.

"I stacked the two Rank 6 'Saint Chronicle Dragon King Gaia Dragon Rider' units on the field again, and upgraded them to Super Stream Transformation—"

—Tier 7, Swift Thunder Knight Gaia Dragon Rider, summon two together as they advance to the next tier!

The two dragon kings disappeared in the vortex of ascension. Gaia warriors, clad in full armor, rode war dragons, which roared and hissed. Their red armor reflected golden light, and their wings flapped to create transparent whirlwinds as they arrived.

[Thunder Knight - Gaia Dragon Rider, Attack Power 2600] x2
"Upgrade to Supercharge. What is it this time?" Jonouchi remained completely bewildered.

But he only understood one thing: the opposing team's lineup was becoming increasingly impressive, and his own situation was becoming more and more dangerous.

Only then did Kujo Mahiru finally finish her storytelling.

Here's a brief summary of the process and the ending.

Special Summon Tefnu Dragon, Tribute Tefnu Dragon to Fly Dragon from the Deck. When Tefnu Dragon is Tributed, Fly Electric Tail Dragon from the Deck. Stack Electric Tail Dragon and Tefnu Dragon to obtain the first Atem Dragon King. Atem Dragon King uses materials to Fly Red-Eyes Dark Iron Dragon. Dark Iron Dragon's effect revives Electric Tail Dragon from the Graveyard. Then Normal Summon Ashe Dragon, and Stack to obtain Atem Dragon King Unit 2. Atem Dragon King Unit 2 Special Summon Dark Iron Dragon Unit 2. Dark Iron Dragon revives Electric Tail Dragon. Stacking the two Dark Iron Dragons results in Cannon.

The two Atum Dragon Kings that were unable to attack at last transformed into Gaia Dragon Riders.

So in the end, he had a cannon, two Gaia Dragonriders, and one Electric Tail Dragon. A single wave of attacks was more than enough to finish them off.

"First, the effect of Gustav's Cannon activates!" Kujo said, "Removes one Xyz Material and inflicts 2,000 damage to the opponent once per turn!"

Jonouchi was shocked: "Two thousand damage in one go!?"

This is incredibly brutal for a 4000 health environment. Especially in the early stages of DM, delivering effect damage with such force seems even more outrageous.

An excess of material was absorbed by the cannon on the track, which crashed down, locked onto the target, and fired.

boom!
Jonouchi was struck head-on by the golden cannon fire, falling backward as if his body had been hit in the chest by a speeding train, feeling as if all his bones had been crushed.

For a moment, he was even a little surprised that he hadn't died. He staggered and gasped as he stood up, finding that his hands and feet were still there and his body was intact, as if the excruciating pain that had almost caused him to faint was just an illusion.

【Within the city, LP4000 → LP2000】

"Another dark duel?" Jonouchi gritted his teeth.

He was no stranger to the concept, but he was growing increasingly disgusted with this kind of life-or-death game.

"It's battle mode now, let's finish them off in one go!" Kujo shouted. "First up, the Gustav Super Cannon, attack the 'Red-Eyes Black Dragon'!"

The cannon had no restriction against attacking after its effect was activated. It was reloaded, and this time it locked onto the location of Red-Eyes and fired a shot. The Red-Eyes Black Dragon inside the castle was completely unable to resist and was torn to pieces by that single shot.

【Within the city, LP2000 → LP1400】

Jonouchi shielded himself with one hand and staggered back half a step.

"In that case, the monster that can protect you no longer exists. It seems that your so-called ace is nothing more than a larger cannon fodder."

Kujo Mahiru took a step forward, her momentum like a rainbow.

"The final blow! Swift Knight Gaia Dragon Knight, attack directly!"

The war dragon flapped its wings, carrying the knight across the entire field, its spiraling lance piercing straight through the air!

"Who wants to fall so easily!" Jonouchi shouted. "Activate face-down card, Trap Card 'Health Enhancer Super Z'!"
This card can only be used during the damage calculation phase of your opponent's turn. If you are about to take more than 2000 damage in combat, it restores 4000 health points!

【Within the city, LP1400 → LP5400】

The spiraling spear pierced through him, the fierce thrust making him feel as if his heart had been pierced as well. Jonouchi staggered back and half-knelt on the ground, but after taking a deep breath, he quickly and stubbornly stood up again.

【Within the city, LP5400 → LP2800】

(End of this chapter)