Senji's origin story finally answers why a man who weaponizes his own body chooses to save people instead of destroy them. The OVA doesn't just fill gaps from the manga, it reframes who Ganta's future rival actually is, turning him from mystery into tragedy. One episode, zero wasted moments, and suddenly the main series hits different on rewatch.

Two years after a catastrophic tidal wave swept over Japan, police officer Kiyomasa Senji is working to make the world a safer place. He uses his Branch of Sin powers to stop criminals however he can. After he saves a boy named Izuru Tsukiyoshi from a gang called Goreless Peace, the clash between Senji and his enemies grows rapidly until it turns explosive. Set before the main Deadman Wonderland story, this single OVA leaves Ganta and Shiro aside and centers entirely on Senji, offering a look at his past and the reasons behind his later actions. The action horror piece came bundled with the limited edition of the eleventh manga volume.