User blog comment:Gsimenas/Volume 8 Yen Press naming/@comment-28251580-20160828101938/@comment-6697950-20160828130828

I think the anime called it "Murder in the Safe Zone". I've also seen "A Crime Within the Walls"

The original term specifically referred to the anti-criminal code, rather than just calling it safe X. The fan translation kept this nuance, though the literal translation would be simpler, like "Area Incident" or "Incident Within the Area". It didn't specify murder.

Either way, I'd prefer to keep the nuance, so I vote for keeping the fan translation. Would also save us from having to update references. We could just note the Yen Press title.