Technician Arashiyama, a shipyard laborer under Chairman Kuroshio, unwittingly triggers a chain of fateful events during a coastal fishing trip with his son, Hayato. When he rescues Kuroshio and his wife from a violent car crash, the group retreats to a decaying mansion amid a storm, confronting a spectral skeletal entity professing to command a phantom vessel.

Days later, a towering mechanized terror ravages the city, slaughtering countless civilians—Arashiyama and his wife among them. With his final breath, he unveils a buried truth to Hayato: the boy is not his blood, but a child salvaged from a shipwreck’s aftermath. This confession anchors Hayato’s lineage to the enigma of the phantom ship and Kuroshio’s shadowy machinations.

Arashiyama’s inadvertent role in preserving the chairman’s life intertwines him with clandestine schemes, while his death ignites Hayato’s relentless pursuit of justice and answers. A humble technician and devoted adoptive father, his ordinary existence belies his narrative significance—his choices and sacrificial revelation forging the protagonist’s resolve and unraveling a labyrinthine conspiracy.