Hyperdimension Neptunia mk2 (or Choujigen Game Neptune mk2 in Japan) a 2011 role-playing video game developed by Compile Heart and Idea Factory, with assistance from Nippon Ichi Software, Gust Corporation, 5pb., and the recently founded company Comcept by Keiji Inafune. It is the sequel to Hyperdimension Neptunia, announced on April 12, 2011, for the PlayStation 3.