3 A.M., rain on the dead-hours store. A calm night-owl customer — a tired man in a plain jacket — sets a single rice ball on the counter to buy, and it will not scan. No beep, no code on the wrapper, nothing in the system. Kaito, unable to sell it, give it away, or prove a thing that can't be rung up even exists, declares quiet war on one barcode and spends the entire dead shift trying to complete a single sale. He tries manual entry on a blank wrapper, flips a price binder that lists everything but this, interrogates the tracksuit regular about whether a rice ball has ever in the store's history failed to scan (nobody can verify), fends off a drunk salaryman's useless advice, and waits out head office's hold line — each failed attempt landing on the identical dead-eyed beat of Kaito holding the rice ball flat to the dead scanner and muttering '...nothing.' Rin livestreams the whole vigil as 'Man vs Rice Ball,' with one flicker of near-sincerity — 'you really can't just hand it to him?' — before raising her phone again. Near dawn, hollow, Kaito finally sets the rice ball down to log it as a defect — and picks up the OTHER identical rice ball beside it, which scans on the very first try, the running beat inverted into pure elation. Then the reveal she planted hours ago pays off: the one he'd been scanning all night was Rin's own snack, brought from home, never store stock, never sellable; the customer's real rice ball would have worked the entire time. But the man left at four, told by Rin's stream that Kaito would never finish, so the sale he finally completed has no buyer. Unable to bear a rung-up rice ball nobody's bought, Kaito buys it himself out of his own wallet — and Rin immediately takes it and bites. 'Man vs Rice Ball. Six hours.' hits four hundred thousand viewers; Kaito gets nothing, not even the rice ball. Dawn light fills the spotless store exactly as the night began — and on the freshly bare counter a stranger sets down a single fresh rice ball, Rin's phone already raised, already live.