Sato and Okura both worked alongside Toyama in the Siren series as lead character designer and lead game designer respectively, and Sato also worked as producer of The Last Guardian.
Toyama announced on December 3 that he had left Sony Interactive Entertainment Japan Studio alongside colleagues Kazunobu Sato and Junya Okura to found Bokeh Game Studio.
Okura was also lead game designer on the Gravity Rush series.
The title will be the first release for Bokeh Game Studio.