One Quirk malfunction was enough to send the whole world reeling in a way that even the war couldn’t.

Somewhere in Japan, someone had an out of control Quirk that was turning people into mindless husks of their former self.

It wouldn’t be so much of a problem.. if these husks didn’t retain their Quirks and the skills they learned. They still turn others into zombies through biting them through.

The zombies prefer traveling in hoards and groan as though they were speaking their own language.

A pack of Quirkless zombies is nothing.

A pack of zombies with Quirks is.. more of a problem. Especially since they keep training after death.