Sirens shred City Z as a Dragon‑level threat turns blocks to dust. Genos (Tom Holland) rockets in—ion cannons blazing—only to meet a bored guy in a bargain hoodie carrying discounted leeks. Saitama (Jason Statham) sighs, drops the groceries, and the shockwave scrubs the sky.

BOOM. Cue barrage: Hero Association briefings in panic mode, Speed‑o’‑Sound Sonic’s blade kiss, subterranean titans, a meteor boiling the clouds, and a living ship eclipsing the moon. Genos rebuilds between fights; Saitama just wants a sale that isn’t sold out.

Training “routine” flashes (100/100/100/run) as rumors spread of a caped baldy stuck at Class B. The city learns the punchline: one hit, end scene—until a foe arrives who doesn’t fall the first time. Psy‑tempest tears the skyline, Genos yells “Sensei!” and Saitama mutters, “OK.” The crater blooms—cut to title.