Portopia Renzoku Satsujin Jiken (Japan) is a Japanese adventure game released for the NES. It's notable for being one of the early examples of the adventure game genre on the NES, potentially influencing other titles in the same genre.  Further information on the developers and the exact storyline is likely available in Japanese language game resources. It is an early game and so development would be more rudimentary.

Portopia Renzoku Satsujin Jiken (Japan)

Popeye no Eigo Asobi (Japan)