The most popular virtual reality massively-multiplayer online (VR MMO) game in Yureka. It was developed by Dexon Entertainment, but particularly one individual. The game is played using a VR headset, a player's unique game ID card, and the game itself. It was in rival competition with the other popular VR MMO, Cyberquest.
A the end of the Demon Invasion Arc, it was revealed that it was originally a beta version of the game itself the whole time and was mistaken as the actual one, even by the Dexon admins and corporate leaders.
It ended with the in-game event "Last Saga," and players were reincarnated in Lost Saga II, an ambitious game merger using Lost Saga and Cyberquest players with the Lost Saga sequel settings.