Supermarket Beikado employee Kanzaki receives death threats over the phone. He hires Kogoro to investigate the threats, but Kogoro believes it to be a prank played by a friend. However, an incident occurs the following day on Sunday. A man wearing a ski mask appears at Beikado. While shouting, "Die, Kanzaki," he stabs the man dressed in Beikado`s mascot Bekapon costume and runs away. The victim is employee Shimomura. Every Sunday, Kanzaki interacts with customers dressed as Bekapon, but due to a stomach ache, Shimomura wore the costume in his place. Megure believes the culprit accidentally…