Senji was the first "Deadman" that Ganta encountered at the prison. After making their way to sector G, Crow destroyed the Necro Macro security robot which had been chasing Ganta, Shiro and Yoh. After a small skirmish, and an interruption by Shiro, Crow was subdued by the Deadman security. The next day, Ganta and Senji were slated to be the next two Deadmen to compete in the "Carnival Corpse." Despite Senji's experience and skill with his 'branch' ability, Ganta managed to win by fooling Senji. As a consequence for losing, Senji's right eye was removed for research. He returns a short time later during Ganta's next match, sporting an eyepatch and gives Ganta assistance with figuring out his opponent's techniques. He also helps Ganta understand his own capabilities. His change in personality toward Ganta is due to his respect for Ganta's strength. Senji comments that because Ganta beat him, he is not allowed to lose until they have a rematch.   He seems to thoroughly enjoy violence, and his favorite phrase is "Dead Center" (or in the dub of the anime, "Sssslice."). Despite his wild and battle-hungry attitude, he does have a sense of honor and respects strength and determination. In an ironic twist, Senji becomes flustered and embarrassed when a woman acts immodest. When he first notices Shiro's form fitting body tights, his face becomes red and he give her his coat telling her to quickly cover up.   His Branch of Sin is called "Crow Claw". It manifests as two large scythe-like blades, made of blood, extending from long cuts on his forearms. He makes these cuts using two bladed rings he wears on his thumbs. While the blades are typically two to three feet long, Senji has demonstrated the ability to greatly lengthen them allowing him to attack people at range. He is responsible for naming Ganta's 'Branch of Sin' (Ganta Gun).  He also has a supersonic attack called Invisible Black.   Senji used to be a policeman before his time in DW. It's hinted that he killed four friends.    ~!It's revealed in his fight with a Forgery that Senji did not kill them, but was indirectly responsible for their deaths. After the Tokyo massive earthquake, chaos ruled in Seiji's inspection area, and out of the corrupt police force, only Seiji and his friends were active against the local crimes. Their actions soon drew hostile attentions of many hoodlums, especially to Seiji since the branch of sin he possessed was a powerful asset. They challenged Seiji to a many-on-one battle, but his friends stopped him and took on the offer, and ended up savagely murdered in his place. As such, he partially believes Ganta in that he did not kill his friends, because he has experienced similar circumstances  !~

Ganta is the only survivor after a mysterious man in red slaughters a classroom full of teenagers. He's framed for the carnage, sentenced to die, and locked away in the most twisted prison ever built: Deadman Wonderland. And then it gets worse. 
At Deadman Wonderland, convicts are forced into brutal deathmatches for the amusement of the masses, the cheers of the crowd drowning out the screams of the dismembered. Even when Ganta befriends Shiro, an unusual female inmate, his dark fate crushes all hope &mdash;until he discovers the strange ability to wield his spilled blood as a weapon. Ganta learns his new skill might be related to the murderous man in red and uncovers disturbing secrets that could expose those who stole his freedom. He's determined to see justice served &mdash;but first he'll have to fight for his life in a prison that holds a million ways to die. 
(Source: FUNimation)

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Between voice acting, script-adapting, and directing, Patrick Seitz has had the pleasure of working on hundreds of different video games and anime series over the past 20 years. His voice credits include Endeavor MHA, Franky One Piece, Dio JoJo’s Bizarre Adventure, plus a variety of video game voices like Arthas Menethil and Garrosh Hellscream from World of Warcraft. Seitz’s script-adapting credits include the English dubs of the animated feature films Summer Wars and Wolf Children, as well as series such as Aggretsuko, and he has directed a bevy of Japanese RPGs.

_Source: Crunchyroll Expo 2020_

The inmates of this insane penitentiary fight for survival every day to provide entertainment for the masses, and terrifying secrets lurk in the shadows. Ganta is determined to survive Deadman Wonderland and clear his name, but the price may be his soul…
 
(Source: Viz Media)
 
Note: Volume 12 contains 6 short side stories, which counts as 1 whole chapter.

Two years after the catastrophic tidal wave that swept over Japan, police officer Kiyomasa Senji is trying to make the world a safer place. Using his Branch of Sin powers, he stops criminals in whatever ways he can. After rescuing a boy named Izuru Tsukiyoshi from a gang called Goreless Peace, the conflict between Kiyomasa and his adversaries heats up rapidly, to the point of being explosive. 
 
Offering a glimpse into the past of the future Deadman, the story follows Senji, helping to further develop the reasoning that drives his actions later in life. 
 
(Source: MAL Rewrite) 
 
Note: OVA bundled with the eleventh volume of the Deadman Wonderland manga.