Deadman Wonderland, Volume 4 (Deadman Wonderland #13-16)

Ganta is recruited into Scar Chain, an antiestablishment group planning a mass prison escape. After a brief meeting with Shiro, he stands at a crossroads, but Nagi persuades him to take part in the escape. However, a traitor has already leaked the plan to the Undertakers, a unit specially formed to stamp out the rebels.