Groper Train: Search for the Black Pearl

The world's largest black pearl has vanished without a trace, and it's up to Detective Ippei to track it down. His only clue is the mysterious words of a dying man, who managed to mutter "Pussy Print!" before slipping away forever. Teaming with the man's younger widow Matsuko, Detective Ippei boards a local train and begins taking prints of the female passenger's vulvas in hopes of matching one to…