Shuumatsu No Majo To Ningyou summary:

The Great Collapse Era. In the near future, civilization has collapsed due to a large-scale disaster and war, and has one foot in the apocalypse. Detective Zoe, a young girl struggling to maintain security, gets caught up in mafia trouble and saves an elderly woman. But then a giant puppet weapon released by the Mafia's pursuers appears. Meanwhile, the old woman also has some kind of disturbing secret.....?