tsukuda, a man's wife's nephew.

She is a married couple who works for the Imperial Capital Security Investigation Division. One day, during the investigation of many tsukuda incidents on the train, Sakai himself encountered a tsukuda and lost the man who was the main offender. He lost the criminal in his own misfortune and fell down. However, when he was investigating the captured man, it turned out that it was not just a coffin incident, and Sakai started to investigate the coffin group again. At last, he found the headquarters of the organization, but among them were men holding guns and waiting for Satoshi's husband to be a hostage.