Deku opens hard and fast, because Izuku Midoriya did not survive every broken bone, every screaming tendon, every impossible odds scenario by hesitating. He launches into Faux 100% Manchester Smash before Luffy even grins, the shockwave cratering the ground and folding Luffy into a perfect accordion shape against a concrete wall. The hit is real. The damage registers. For one full second, Luffy is a flat rubber silhouette pressed into the masonry like a cartoon decal, and Deku drops into a ready stance — Detroit Smash follow-up already loaded, One For All crackling green and violent across every knuckle. This is a genuine, thunderous exchange. Deku is operating at the absolute ceiling of his ability, and it shows.
Then Luffy peels himself off the wall. Literally. He grabs his own flattened face and pulls it back into shape with a *pop*, eyebrows reforming last, and he is grinning so wide his teeth precede the rest of him. "That was a good one," he says, completely sincere. Deku's follow-up Detroit Smash connects cleanly — Luffy's head stretches back three metres, snaps forward, and the recoil knocks Deku off his feet instead. This is where the fight shifts. Every physical law that makes Deku's Quirk lethal — force transfer, impact physics, structural damage — is running on an operating system Luffy simply does not share. Toon force is not a power. It is a different genre, and Deku brought a textbook to a cartoon.
Luffy goes Gear Fifth, and the battlefield stops being a battlefield. His laugh fills the sky — *AHAHAHAHA* — and he inflates his fist to the size of a building, bounces off a cloud that had no business being at ground level, and comes down in a Gomu Gomu no Bajrang Gun that Deku reads perfectly, pivots perfectly, and redirects with a Blackwhip anchor into the earth. The impact flattens a city block. Deku survives it, battered but upright, green lightning still alive across his arms. He is extraordinary. He simply cannot close the loop. Every finishing scenario he constructs assumes that damage accumulates permanently — and on Luffy right now, it does not. The toon-force rewrite erases the ledger before Deku can collect.
The ending comes not with a speech but with a sound: a single ridiculous *boing*. Luffy stretches both arms back to the horizon, wraps them around Deku's Blackwhip mid-swing, and uses the binding like a slingshot to launch himself forward at speeds that don't have a name, delivering a Gomu Gomu no Giant — fist the size of a house — directly into Deku's chest. The boy from U.A. hits the ground skidding, One For All flickering, and does not get back up in time. He gave everything. The physics just weren't on his side — because for Luffy in Gear Fifth, physics is optional.
WINNER: Luffy REASON: Gear Fifth toon-force means Deku's otherwise devastating physical offense cannot produce a permanent result, and Luffy's cartoon-logic rewrites the fight's rules entirely outside Deku's ability to counter.