Cat the Ripper 13 Ninme No Tanteishi is a first person perspective adventure game based on a novel by Masaya Yamaguchi, the game begins when the player's character wakes up dizzy and confussed in Christopher Browning (a private detective) office until he discovers that next to him is the corpse of the detective that was killed by the mysterious murderer called Cat the Ripper.

He first will try to search the office for possible clues but when he starts to find something a couple of police guys (the man is Kid and the woman is called Pink) appears and he will have to escape from them and try to avoid being catched. Now is up for the player to escape the police, discover the truth and try to catch that killer.

The gameplay is the usual in the first person adventures. Meet characters, talk to them, use objects to advance in the game, etc.