3 A.M., rain on the dead-hours store. Kaito has just cleaned the store to a spotless calm when a smell — faint, sour, unplaceable — drifts through the aisles. Unable to bear one invisible flaw in his immaculate kingdom, and certain something is rotting before the morning delivery arrives, he declares war on the smell and sets out to find its source. The catch: the smell is real, but nobody can agree where it is. The tracksuit regular can't smell a thing; a tired salaryman swears something has died; a cheerful jogger insists the air is fresh — three verdicts that cannot all be true. Kaito hunts it on hands and knees across the whole store — the trash, the drain, the cooler vents, under the counter — each promising lead landing on the same dead-eyed beat of him freezing nose-first and muttering '...stronger here,' always wrong. Rin quietly livestreams the whole descent as 'What Is That Smell.' She has one flicker of near-sincerity — noticing he genuinely can't let it go — before raising the phone again. Near dawn, broken, Kaito finally gives up and sinks onto the stool beside her — and that is exactly where his nose twitches one last time, the running beat inverting: the smell is strongest right there. Rin lifts the plain half-eaten foil snack bag that has sat open on the counter beside her since the start of the shift — a novelty stink-snack she cracked on camera hours ago. It was the source the entire time, an arm's length from him all night. His six-hour hunt only fed her stream. She offers him the last chip; he refuses to eat the thing that ruined his night, so she eats it herself. 'What Is That Smell — six hours' hits four hundred thousand viewers. Kaito gets nothing. Dawn light fills the spotless store exactly as the night began — and Rin peels open a fresh, even more pungent bag, and Kaito's nose twitches all over again as we cut out.