No. 6 manga omnibus volume 2 collects volumes 4-6 in a larger sized omnibus format and features story by Atsuko Asano and art by Hinoki Kino.

After stumbling across his childhood friend Safu’s favorite coat on the streets of West Block, Shion learns that she has been arrested and imprisoned in No. 6’s infamous Correctional Facility. He sets out alone to save her, but the ever-watchful Rat has other plans.

Meanwhile, No. 6 prepares to launch a host of soldiers and armored vehicles in a manhunt through West Block. Shion’s and Rat’s fates grow ever more tightly intertwined as they embark on an impossible mission to No. 6, where Shion will learn the ugly history behind the “perfect” city.