Hiroyuki Seguchi

Long is a Taiwanese killer known for his sword skills. After Long fails a Tokyo mission, he moves to a small town where no one knows about him.

Tokyo Bay Water Police, formed to combat rising maritime crime in under-patrolled waters contrasting land's high-surveillance success, unites a fractured team of officers—a veteran leader, an ambitious transfer detective, and a skilled marine engineer—whose clashing backgrounds evolve into collaborative resilience as they solve coastal crimes and protect Tokyo’s waterways.