Screen 1
The rooftop trembles as the battle begins.
Luffy steps forward first.
He activates Gear Third, his arm expanding as advanced Ryo flows through it.
With a powerful swing, he lands a direct hit on Kaido's body.
The impact shocks everyone. Even Big Mom's eyes widen for a moment.
Ben watches the opening.
"Alright… my turn."
The Omnitrix flashes.
"Humungousaur!"
Ben grows into his giant form and charges in beside Luffy.
After the first clash, he taps the Omnitrix again, pushing into his Ultimate Humungousaur state.
Dark Haki spreads across his arms and scales.
Ben focuses, channeling Ryo through his massive fists.
He steps forward and throws a heavy Haki-coated strike toward Kaido, the air cracking from the pressure as the second assault begins.
Screen 2
Kaido looks down at Luffy with a serious expression.
"You've grown stronger… only a handful can stand in front of me like this."
Before anyone can react, Kaido swings his club.
The counterattack hits hard and sends Luffy sliding back across the rooftop, injured but still conscious.
Ben steps forward immediately.
Ultimate Humungousaur's armor glows as energy gathers along his back.
"Bio Missiles… fire!"
A volley of energy blasts launches toward Big Mom, forcing her to block.
Ben follows up, coating his fists with Ryo Haki, the pressure rippling through the air.
He lands a heavy strike that pushes Big Mom back a step, briefly exposing an opening in her guard.
Big Mom growls, surprised that the alien's Haki can reach her.
Ben lowers his stance beside Luffy.
"Stay up, captain. We're not done yet."
Screen 3
Big Mom rushes forward, lightning and fire swirling around her as she targets Luffy.
Before the attack lands, Ultimate Humungousaur steps in front of him.
Ben crosses his arms, Armament and Ryo Haki flowing over his scales, taking the impact head-on. The shockwave shakes the rooftop, but he holds his ground.
Ben: "You're not touching him."
At the same moment, Zoro flashes in from the side.
Three swords drawn, aura sharp and focused.
Zoro: "Oi, dinosaur… leave the opening to me."
He unleashes a powerful slash toward Big Mom, forcing her to shift her stance and block. Sparks fly as steel meets her defense, giving Luffy a moment to recover behind Ultimate Humungousaur.
The battlefield splits into chaos again — Ben guarding, Zoro attacking, and Big Mom finally taking the fight seriously.
Screen 3
Big Mom rushes forward, lightning and fire swirling around her as she targets Luffy.
Before the attack lands, Ultimate Humungousaur steps in front of him.
Ben crosses his arms, Armament and Ryo Haki flowing over his scales, taking the impact head-on. The shockwave shakes the rooftop, but he holds his ground.
Ben: "You're not touching him."
At the same moment, Zoro flashes in from the side.
Three swords drawn, aura sharp and focused.
Zoro: "Oi, dinosaur… leave the opening to me."
He unleashes a powerful slash toward Big Mom, forcing her to shift her stance and block. Sparks fly as steel meets her defense, giving Luffy a moment to recover behind Ultimate Humungousaur.
The battlefield splits into chaos again — Ben guarding, Zoro attacking, and Big Mom finally taking the fight seriously.
Screen 4
Law suddenly appears beside Luffy and pulls him away from Kaido's swing using his Room ability.
Luffy: "Hey! I was still fighting!"
Law: "You were about to get knocked out again."
Kid smirks: "Both of you talk too much. Let's finish this already."
The three captains stop arguing and release their strongest power.
Luffy activates Gear Fourth.
Kid surrounds himself with metal weapons.
Law expands a massive Room across the rooftop.
Meanwhile, Ultimate Humungousaur steps forward, fists coated in Ryo Haki.
Kaido charges straight at him.
Hand to hand combat begins.
Humungousaur blocks Kaido's club with both arms, the impact cracking the ground beneath their feet. Ben roars and throws a heavy punch into Kaido's chest, forcing the Emperor back a step.
Kaido grins.
Kaido: "Good… you're finally fighting like a monster."
The rooftop shakes as Ultimate Humungousaur and Kaido trade massive blows while Luffy, Law, and Kid prepare their combined assault.
Screen 5
Luffy activates Gear Fourth: Boundman, his body covered in Ryo Haki as steam rises from his arms.
Kid builds his massive Punk Rotten armor, metal pieces spinning around him like a storm.
Law expands a huge Room, lifting debris and twisting the battlefield to control Kaido's movements.
Beside them, Ultimate Humungousaur charges forward. Bio-missiles form along his arms, glowing with energy while Ryo Haki coats his fists and tail.
Luffy launches a powerful punch.
Kid slams down with crushing metal force.
Law bends space to open Kaido's guard.
At the same moment, Ultimate Humungousaur fires his bio-missiles and follows with a Haki-charged strike, the combined attacks exploding against Kaido's body.
The rooftop trembles as all four fighters unleash their full power together.
Screen 6
Smoke clears from the combined assault… but Kaido is still standing.
His body shifts — scales tighten, horns grow larger, and he transforms into his hybrid form. The air becomes heavy with Conqueror's Haki. Thunder cracks as he swings his club, releasing a shockwave that tears the rooftop apart.
Ultimate Humungousaur pauses for a second, surprised but not afraid.
Ben tightens his stance, claws digging into the stone.
Ben: "So that wasn't even your final form… figures."
Kaido rushes forward with overwhelming speed. The impact sends Ultimate Humungousaur sliding back several meters, scales cracking but not breaking.
Instead of charging blindly, Ben adjusts his strategy:
Raises both arms, coating them in Ryo Haki to block the next strike.
Fires smaller bio-missiles to create space and protect Luffy.
Lowers his center of gravity, focusing on defense and teamwork instead of solo power.
Ultimate Humungousaur realizes something important: raw strength alone won't beat Kaido.
Ben (focused): "Alright… no more brute force. We fight smart now."
Screen 7
The rooftop turns into chaos as the allies begin to synchronize their attacks.
Law expands his ROOM and rushes forward, striking Kaido with Gamma Knife, sending a shock through Kaido's body from the inside. Killer follows with a fast spinning strike, landing a clean hit that forces Kaido to step back.
Zoro steps forward next. His swords glow with intense Haki as he unleashes a technique reminiscent of Kozuki Oden. The slash cuts across Kaido's chest, leaving a deep scar. For the first time, Kaido looks genuinely surprised.
Seeing the opening, Ultimate Humungousaur roars and taps the Omnitrix.
Green light flashes.
"ULTIMATE ECHO ECHO!"
The massive armored form shifts into a sleek, blue metallic alien covered in glowing sonic disks. Ultimate Echo Echo floats above the battlefield, speaker-like plates humming with energy.
He raises both hands and releases a controlled sonic pulse, pushing back incoming debris and creating space for Luffy and the others.
Ben: "You guys keep the pressure on. I'll handle the crowd control!"
The sonic disks separate from his body, multiplying and surrounding Kaido, ready to unleash a focused barrage while the alliance prepares their next move.
Screen 8
High above the battlefield, hidden in the shadows, the masked agents of CP0 watch the chaos unfold. One of them calmly notes how Kaido's forces still outnumber the samurai, even with the rebellion pushing forward.
Then their attention shifts.
A blue shockwave bursts across the rooftop as Ultimate Echo Echo releases another sonic pulse.
CP0 Agent 1: "That alien again… his power doesn't follow any known Devil Fruit classification."
CP0 Agent 2: "Not Logia. Not Zoan. Not Paramecia. Yet he uses Haki like a veteran. The World Government's data on him was incomplete."
Below, Otama throws her dumplings, turning several Beast Pirate soldiers to the alliance's side. The battlefield balance begins to shift.
CP0 Agent 3: "First the Straw Hat's growth… now this 'Green Demon.' If he keeps influencing the war, Kaido's numbers advantage will collapse."
They remain still, observing rather than interfering.
CP0 Agent 1: "Do not engage. Our mission is observation… but report this clearly. Ben Tennyson is no longer just an ally of Straw Hat — he is a variable that can change the outcome of Yonko-level battles."
The agents fade back into the smoke, silently reassessing the threat level of Ben as the fight continues below.
Be continued