The Brotherhood is robbing a truck when they are stopped by Detective Ginko. One of the robbers escapes and Coren & Ginko run after him, who eventually gets caught just before he enters the train.
As Ginko emerges from the station, the Inspector and Internal Affairs shows up and arrests Ginko for being related to the underworld and embezzlement.
Diabolik thinks Ginko is being framed and while he is relieved Ginko is locked up, he assumes the brotherhood is involved and goes to clear his name.