Fate/EXTRA CCC, a companion game to Fate/EXTRA, was released in March 2013 after several delays. Instead of being a sequel, CCC is considered to be a separate route to the original game. The game's scenario was written by Nasu, character design by Takeuchi, and the artwork by Wada Rco.

CCC takes place in the same world as Fate/EXTRA, on the "Far Side" of the Moon Cell:

Head to the other side of the Fate Extra, the secret place where only the privileged few are allowed to enter. Because of a bug in the system, the Holy Grail wars is mutated. A new game starts, its lure and power draw magicians from across cyberspace.

Players are exposed to new dangers and the girls reveal a side of themselves that they have kept hidden in the first game. The person who knows the truth is Sakura, and the servant waiting to be claimed is Saber. Full of tension and seduction, this is an adventure that simply could not be missed.