The title was first announced through the website Project Cosmos with a countdown timer and a tagline of “A new fate begins to stir.” The source code of the website contained Hakuno Kishinami’s Command Spell.
The scenario is written by Kinoko Nasu and Hikaru Sakurai, character design is by Arco Wada, and development is by Marvelous. They decided to forgo a title like “EXTRA3” for the work.
XSEED Games announced on 7 June 2016 that they will localize the game in North America as Fate/Extella: The Umbral Star in Winter 2016. A subsequent announcement added a Noble Phantasm Edition LE, while pushing the launch window back to 2017.
A limited number of themed PlayStation 4 and PlayStation Vita models will be made available from the Sony Store in Japan.
Fate/Extella: The Umbral Star is an Action game, developed and published by Marvelous Inc., which was released in Japan in 2016.