Ougon no Rashinban

Ōgon no Rashinban ("Golden Compass") is the second case starring the private detective Ryūnosuke Tōdō, following Kohakuiro no Yuigon. Like the first case, the adventure takes place in the 1920's. This time the investigator finds himself on a ship sailing from San Francisco to Yokohama. A mysterious murder occurs, and it is up to Tōdō to gather evidence and find the culprit.

[From MobyGames]