Following a devastating tsunami in Japan, officer Kiyomasa Senji utilizes his extraordinary Branch of Sin abilities to combat crime and maintain order. His encounter with a young boy, Izuru Tsukiyoshi, saved from the clutches of the Goreless Peace gang, escalates tensions between Senji and his foes dramatically. Unveiling the origins of a future Deadman, the narrative delves into Senji's past, shedding light on the motivations shaping his future choices.