Muhoutou

In the year 20××, the government experimentally revived the exile system in response to the ever-increasing number of violent criminals. Sixty-two criminals whose crimes were considered worthy of the death penalty were instead sent to an island known as "Lawless Island"...

A young man arrives on this island after his family was brutally murdered and he was falsely accused of the crime. Faced with a situation far more horrifying than he could have imagined, the story begins to unfold...

(Source: Hakusensha, translated)