Chapter Text
The Thousand Sunny basked lazily under the midday sun. The sea was calm, the breeze light, and for once, the ship seemed at peace. A flock of gulls circled above, their cries mingling with the gentle slosh of waves against the hull. For the Straw Hats, it was the kind of rare downtime that never lasted long.
Naturally, Usopp decided to ruin it.
He crouched low in the galley, tongue sticking out in concentration as he worked on his “masterpiece.” A simple prank, but effective. His fingers deftly unscrewed the lids of two jars—sugar and salt—and with a mischievous grin, he swapped their places. The labels looked identical, so unless someone tasted it first, nobody would know the difference.
“Perfect!” Usopp whispered, screwing the lids back on and carefully sliding them into place. He rubbed his hands together, grinning from ear to ear. “Sanji’s about to learn why you never underestimate Sniper King’s tactical brilliance! He’ll dump salt in his dessert, and then—boom! Disaster! It’s subtle, it’s classic, it’s genius!” He stifled a laugh, scurried to the galley door, and peeked out.
The coast was clear. Like a ninja, he darted into the hall, already imagining Sanji’s face when the cook’s “perfect recipe” turned into a salty mess. Oh yes. This was going to be beautiful.
————
Sanji entered the galley ten minutes later, sleeves rolled up, humming a tune as he prepared to dazzle. His latest inspiration was a caramel tart, something sweet and delicate that would charm Robin-chwan and delight Nami-swan.
He set out his ingredients with practiced grace, cigarette dangling from the corner of his mouth, and reached for the sugar. He sprinkled a generous spoonful into his mix, stirred, and gave it a taste. The reaction was immediate. His face contorted in horror, his eyes bulged, and he spat the mixture straight into the sink.
“Hah?!” Sanji shouts, slamming the bowl onto the counter. He grabbed the jar, twisted off the lid, and stuck his finger inside. A quick taste confirmed his nightmare. Salt.
“WHO—WHO DARES DEFILE MY KITCHEN?!” His voice boomed like cannon fire. “WHICH WORTHLESS IDIOT SWITCHED THE SUGAR?!”
The ship shuddered with the force of his fury.
Luffy’s head popped around the galley door, eyes wide and sparkling. “Sanji! Are you making snacks?”
“Snacks?!”
Sanji’s hair flared like a demon’s, his cigarette sparking with rage. “I’m making art , and some brain-dead moron sabotaged me!”
“Oooh.” Luffy’s head tilted. “Can I try it?”
Sanji thrusts the bowl into his chest. “Be my guest!”
Luffy took a spoonful, chewed once, and instantly gagged. His cheeks puffed, his tongue stuck out, and he flailed like he’d swallowed poison. “Gwahhh! It’s so salty!” He spat dramatically into the sink, clutching his throat.
“Why’d you make this, Sanji?!”
“I didn’t make it, you simple brained captain!” Sanji hissed. “Someone messed with the ingredients!”
Luffy blinked innocently. “Not me.”
The cook’s eyes narrowed. He stormed past Luffy onto the deck, smoke streaming from his nose like a dragon. The crew looked up from their usual activities as Sanji thundered into view.
“ALRIGHT, WHO DID IT?!” he bellowed. “WHO MESSED WITH MY SUGAR?!”
Usopp, leaning casually against the railing, fought to keep a straight face. His lips trembled with suppressed laughter. Sanji’s gaze swept the deck, and then landed on Zoro. The swordsman sat beneath the mast, dozing with his swords laid across his lap, as usual.
“You,” Sanji snarled, stalking toward him.
Zoro cracked one eye open. “Hah?”
“Don’t ‘hah’ me, marimo! You’re the only barbarian on this ship dumb enough to confuse sugar and salt!”
Zoro’s expression darkened. He sat up slowly, fixing the cook with a flat stare. “What the hell are you talking about?”
“Don’t play innocent,” Sanji snapped. “You hate sweets, don’t you? So of course you’d sabotage my dessert!”
Zoro bristled. “Like I’d waste time touching your precious kitchen crap.”
“Oh, so now you’re too good for it?” Sanji growled, jabbing a finger at him. “Admit it, moss-head—you did it!”
“I was asleep, you curly-browed lunatic!” Zoro barked, standing now, squaring up. “Why would I care about your sugar?!”
“Because you’re petty and stupid, that’s why!”
“Petty?! Says the guy throwing a tantrum over a bowl of sugar!”
“It wasn’t sugar, it was—!”
“SEE?! EVEN YOU DON’T KNOW WHAT IT WAS!”
By now, their shouting had attracted the rest of the crew. Nami sighed from her deck chair, lowering her sunglasses. Robin, ever composed, turned a page in her book, though the curve of her lips betrayed her amusement.
Chopper looked nervously between them. “M-Maybe it was just a mistake?”
“No mistake!” Sanji barked, jabbing a thumb at Zoro. “This bastard’s guilty!”
“Try saying that again, eyebrow!” Zoro snapped, hand hovering near his swords.
The deck trembled under their snarling glares. Sparks practically crackled in the air.
And then—
“PFFFTTT!”
A laugh burst from the railing. Usopp doubled over, clutching his stomach. “Hahaha! Oh man, you should’ve seen your faces!”
Both men turned in unison. Usopp froze mid-laugh.
“…Uh-oh.”
Zoro’s glare could have cut steel. Sanji’s face darkened with a devil’s shadow. “USOPP!” they roared together.
The sniper squeaked like a startled mouse and bolted. “It was just a prank!” he cried, legs pumping as he fled across the deck.
Sanji sprinted after him, flames bursting from his heel. “You little rat!”
“Coward!” Zoro barked, already chasing him too. Usopp dodged between barrels, scrambled up the stairs, and leapt over the railing, screaming all the while.
“Luffy, help me!”
“Shishishi! This is fun!” Luffy cheered, bounding after them like it was the best game ever.
Chopper ran after them too, half-worried, half-laughing. “Wait, don’t kill him!”
Nami shook her head, sighing. “Idiots.”
Robin closed her book, eyes gleaming with quiet amusement. “It seems we’re about to have a very interesting day.”
Brook’s voice carried from the upper deck, laughing. “Yohoho! A prank war, is it? Excellent! May I request a theme song?”
The deck dissolved into chaos: shouting, running, Luffy egging them on, Usopp screaming for mercy, and Sanji and Zoro both vowing death.
And just like that, the Great Straw Hat Prank War had begun.