It has been about decade or more since the fifth Holy Grail War and everyone has continued with their lives.
However, Rin of the HF route has already been pushing the limits of conventional magecraft and has decided to do some jeweled/Zelretch research. This results in Rin asking Shirou to recreate the Jeweled Sword.
Yet, some unknown flaw occurred when Rin decided to test it out and ends up tearing several dimensions asunder. These dimensions are basically meshed together.
However, physically contradictions that cannot occur do occur and forces Gaia to reset the newly created dimension to a point before the contradictions occur(i.e. right before the grail war).
Serious situation:
Basically everyone has knowledge of what has already occurred in some variations if they were alive by that time. In other words, Shirou in this new dimension has all knowledge from all endings except for the Normal Ending of HF while Rin would know of all endings in Fate Stay Night. Besides the utter mind collapse that Shirou would have for a while because of his ideals, new decisions are made by everyone.
Comedic situation:
Shirou and others have knowledge from every possible parallel universe, including crack universes. Think of the mind induced trama.
However, Rin of the HF route has already been pushing the limits of conventional magecraft and has decided to do some jeweled/Zelretch research. This results in Rin asking Shirou to recreate the Jeweled Sword.
Yet, some unknown flaw occurred when Rin decided to test it out and ends up tearing several dimensions asunder. These dimensions are basically meshed together.
However, physically contradictions that cannot occur do occur and forces Gaia to reset the newly created dimension to a point before the contradictions occur(i.e. right before the grail war).
Serious situation:
Basically everyone has knowledge of what has already occurred in some variations if they were alive by that time. In other words, Shirou in this new dimension has all knowledge from all endings except for the Normal Ending of HF while Rin would know of all endings in Fate Stay Night. Besides the utter mind collapse that Shirou would have for a while because of his ideals, new decisions are made by everyone.
Comedic situation:
Shirou and others have knowledge from every possible parallel universe, including crack universes. Think of the mind induced trama.