Custom's Picks: Fate/Grand Order

This is from Episode 0: Initium Iter, which is the prologue that takes place before the events of the FGO anime, "Absolute Demon Battlefront: Babylonia. This is pretty much about an researcher named Romani "Roman" Archaman joined in Chaldea and act as the primary doctor for Mash Kyrielight, a designer's baby who was turned into a Demi-Servant, a Heroic Spirit put inside the physical body of a human who had gone berserk before being suppressed. This is the start of Mash's journey to enter the Seventh Singularity and save the world through time travel.