In a Holy Grail War, Mages (Masters) and their Heroic Spirits (Servants) fight for the control of the Holy Grail—an omnipotent wish-granting device said to fulfill any desire. Years have passed since the end of the Fifth Holy Grail War in Japan. Now, signs portend the emergence of a new Holy Grail in the western American city of Snowfield. Sure enough, Masters and Servants begin to gather... A missing Servant class... Impossible Servant summonings... A nation shrouded in secrecy... And a city created as a battleground. In the face of such irregularities, the Holy Grail War is twisted and driven into the depth of madness. Let the curtain rise on a masquerade of humans and heroes, made to dance upon the stage of a false Holy Grail.

One of the Lords of Dark Beasts, Clevatess’s reign shatters when he revives a hero he personally slayed and adopts an orphaned humanoid baby—the last hope to save a dying world. Now bound together, what fate awaits this unlikely trio?

Step right up to 1950s Japan! The postwar economy is booming, but the Sunflower Circus is not. Led by ringmaster Maria, the cash-strapped troupe tours the country in desperate competition for a spot in the Circus Collection–an elite global festival. When circus prodigy Mizuka Tsurumaki joins their ranks, the Sunflower Circus’s fortune shifts, finally giving them a shot at big top glory.