Chan and En were the servants of Hagire Rinichirō and his artificial children.   Chan and En both wear the same clothes and look exactly the same way (with the exception of their hair). They wear a black formal suit with a white shirt under it. They also have a red tie. En's hair reaches over her shoulders and Chan's is shoulder length. They are albino so they have red eyes and a somewhat grey skin. 

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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[Website](http://apphiayu.com/) | [Twitter](https://twitter.com/soymilkpudding)

Apphia Yu, also known as Ayu Sakata, is an American voice actress, director, and producer. She has worked on games such as Loren The Amazon Princess and Tales of Aravorn: Seasons of the Wolf, or for anime like Assassination Classroom. She is the founder of sakevisual, a company based in Dallas, Texas that makes original visual novel games. She is married to voice actor [Micah Solusod](https://anilist.co/staff/103686/).

(Source: Wikipedia)

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.