Mugen Souls Z (圧倒的遊戯ムゲンソウルズZ Overwhelming Game: Mugen Souls Z?, Attouteki Yuugi: Mugen Souruzu Z) is a role-playing video game developed by Compile Heart and co-produced by GCREST as the second installment in the Mugen Souls series. It was released in Japan on April 25, 2013 for the and in Korea on October 16 2013 for Sony PlayStation 3. It released in the west on May 20, 2014 on the PlayStation 3 as well the PlayStation Network. The game plays very similar to the previous title but with a lot of fixes and plays a lot faster. Though the original game was very hardcore and takes a long time to get the platinum trophy and is very difficult to learn, Mugen Souls Z adds in a lot more features for veterans of the previous game to take advantage of and shorten their time to power up and mechanics will not need to rely as much on luck.

The game begins with Chou-Chou expanding her conquest in making whole universe hers. In the previous game, Chou-Chou's ambition was to conquer the 7 Worlds representing hues of the rainbow and the 7 Days of the Week if you are familiar with the Chinese or Japanese calendar. Ryuto introduces the upgrades to the G-Castle and the appearance change which now looks like a Giant Robot, Chou-Chou was not really impressed. With these upgrades, they were able to time space travel and moving onto 12 Stars Galaxy, a representation of the tertiary hues, 12 hours of the clock, constellations or the number of months in a year.

Chou-Chou is no longer the controllable in this game due to her getting absorbed into a coffin which malfunctioned. It was not able to absorb "Undisputed" Gods since it was only meant for Ultimate Gods use, the class of the Syrma in the game.