Yuji Horii's second published game (after Love Match Tennis), Portopia Renzoku Satsujin Jiken (Portopia Serial Murder Case) is a first-person murder mystery text adventure, which allows players to input commands by selecting them from a verb list and searching onscreen graphics for hot spots.

The story puts players in the shoes of a nameless Japanese police detective on a quest to solve the murder of a bank director. On his travels through real Japanese settings, the nameless, silent protagonist is assisted by his colleague Yasu who carries out his orders.