The video does not contain any company logos, therefore the publisher and developer of the game are unknown. The fact that it is hosted on the PlayStation Japan YouTube channel does not mean it is a Sony Interactive Entertainment title, as the channel has previously hosted teaser videos for third-parties, such as the teaser video for Experience’s Death Mark in December 2016.
The description of the video reads: “The world has ended. As for what remains…? A True End of Century RPG is born. All will be revealed on October 26, 2017.”