Final Fantasy Type-0 HD (ファイナルファンタジー零式 HD Fainaru Fantajī Reishiki HD?) is an action role-playing game developed by Square Enix and HexaDrive, and published by Square Enix for PlayStation 4 and Xbox One, and later for Microsoft Windows via Steam. Type-0 HD is a high-definition remaster of the Japan-exclusive PlayStation Portable game Final Fantasy Type-0, a spin-off from the main Final Fantasy series and part of the Fabula Nova Crystallis subseries, a set of games sharing a common mythos which includes Final Fantasy XIII and Final Fantasy XV. It was released worldwide in March 2015, while the Steam port was released in August 2015. The story focuses on Class Zero, a group of fourteen students from the Dominion of Rubrum who must fight the neighboring Militesi Empire when they launch an assault on the other Crystal States of Orience. In doing so, the group become entangled in both the efforts to push back and defeat the forces of Militesi, and the secret behind the war and the existence of the crystals.