Fics like Fate/Grand Order: Ring of Promise

A single change alters the path of fate. Instead of being killed, Olga Marie is turned into a Demon Pillar. The only person able to save Mash and Ritsuka from this new threat is Doctor Roman, who Rayshifts into Singularity F to save his charges. Upon doing so he summons his own Servant, a woman from his past. The Time of Reunion has Come, how will everything resolve? Arc 1 Spoilers.

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