Post Heaven's Feel Route. Six months have passed since the end of the Fifth Holy Grail War. Shirou and Sakura planned to live out the rest of their days in peace, but suddenly being teleported into an new, unknown world by unknown means with a very mythological problem one day assures that that doesn't happen. Shirou blames it on Archer's E-rank luck.

Following the end of the Heaven's Feel Route. It's been six months since the end of the Fifth Holy Grail War. Shirou and Sakura have moved to America, hoping to live a peaceful life together away from the Clock Tower, but little did they know that they'd get involved with a conflict much more mythological.