Undersea Super Train: Marine Express

In the year 2002, the Marine Express makes history as the inaugural underwater train linking America and Japan. As the train prepares for its inaugural journey, the chief engineer harbors serious concerns that the test run may serve hidden agendas. To uncover the truth, he enlists the help of private detective Ban Shunsaku. However, upon arriving at his client's luxurious residence, Shunsaku discovers that the engineer has been murdered, leaving only a fleeting glimpse of the assailant.

Determined to unravel the mystery, Shunsaku boards the Marine Express, where he quickly realizes that the journey is fraught with peril and unexpected twists. As he delves deeper into the enigmatic secrets concealed within the train, he finds himself entangled in a web of intrigue that stretches far beyond his initial investigation, challenging his wit and resolve at every turn.