Godzilla: City on the Edge of Battle will launch on Netflix on July 18, 2018. It was previously released theatrically in Japan.
The second part in a trilogy of animated movies, Godzilla: City on the Edge of Battle is the continuation of Godzilla: Planet of the Monsters, in which protagonist Haruo Sakaki and his cohorts returned to an Earth they had once lost to the titular beast. That movie ends in desperation, as, having thought they had defeated Godzilla, they discovered their opponent was only a smaller version of the king of the monsters, and the big guy was still alive and well.
Source: IGN.com Netflix's Godzilla: City on the Edge of Battle Review