Steam Detectives

Narutaki's good nature becomes his downfall as he escorts a scared young lady home and is subsequently gassed and knocked out. During the night, a local bank is robbed by a megamaton that looks like Goriki. When Narutaki wakes up, he makes his way home only to have the chief detective of the police waiting for him… they want to arrest Narutaki and remove Goriki's coal. How is Narutaki going to prove their innocence?