while on a magazine photo shoot one night, photographers susumu and yoshito witness a car drive into the ocean. while speaking with a detective the next day they spot makoto jinguji, daughter of deceased imperial captain jinguji, who is also being followed by a suspicious character. her father's former superior, retired rear admiral kusumi is confronted by a peculiar reporter, who claims contrarily that captain jinguji is alive and at work on a new submarine project. the threads meet when a mysterious taxi driver, who almost abducts makoto and the admiral, claiming to be an agent of the drowned mu empire. foiled by the ensuing photographers, he flees into the ocean.