S01E580: The Black Time Limit Drawing Near

Conan arranges the red shirts in the order they were sent and folds them along the creases and deduces that the way the shirts were folded reveal a code. Elsewhere, Jodie spots Akai is on the floor where the bombing incident is taking place. Conan uses the cashier room's computer in order to search for a disaster that occurred in a snowy mountain on December 28. Okiya, who happens to be on the same floor, examines the red shirt and concludes the sender is related to a disaster that occurred on a snowy mountain and smiles slyly when he notices Akai in the crowd. Conan tranquilizes Kogoro and discloses that the bomber's behavior is inconsistent; He was desperate to search for the sender of the red shirts, yet he found the time to kidnap and strap a bomb onto the man. Conan then declares that the man strapped with the bombs is actually the bomber.