Another

Another is the ability of Yukito Ayatsuji.

Description
Ayatsuji's ability causes an accidental death to the target. It ignores and distorts all physical barriers. The causes of death may vary from choking, ceberal infarction, death by falling, suicide, disease, and heart attacks - in which the cause of death itself cannot be predicted and cannot be prevented or canceled out. However, the ability has only one condition to the target - they must be a criminal. Unless it is under this process, the ability will not activate and no death will happen. Whether the target is on the other side of the world or wields enough skill to kill God, it doesn't matter. However, people who manipulate others into committing a crime of their own free will, will not be killed by his ability akin to “how a knife craftsman is not guilty of someone who killed using said knife”

Ayatsuji's ability is not controlled by himself, therefore he does not have any control over his ability once it activates. It is one of the few known abilities that Dazai's No Longer Human cannot neutralize once it activates.

Trivia

 * Another's ability may be a reference to the various graphic and violent deaths that occured in the novel.