Season 1

Due to the anomalous battle taking place in the desert between Archer and Lancer, various factions become aware of the commencement of the Holy Grail War. As the situation unfolds into chaos, Faldeus, tirelessly acquiring information and manipulating the press, catches sight of a girl new to Snowfield. This girl is Ayaka Sajyou, who wanders the city aimlessly. A mark resembling a Command Spell is engraved on her body.

Following the uproar at the opera house, Saber and Ayaka are detained by the Snowfield Police Department.

Clan Calatin finds itself in dire straits after interference from Assassin's Master, Jester Karture. Hansa intervenes, taking up arms not as the Overseer of the Holy Grail War, but as an Executor hunting Dead Apostles. With the Servants dismissed from the stage, the two men clash in a battle fought without Heroic Spirits.

Orlando, busy with caring for the aftermath of the battle, is visited by Francesca.

Shortly before the battle in the canyon, in a mansion situated in a swamp, a lone mercenary attempted to summon a Servant. His codename is Sigma. He holds no desires for this world, nor any intention of leaving anything behind. Chosen by the fake Holy Grail for this empty shell of a man was a Servant so singularly unique that it could never be summoned in a normal Holy Grail War...

After leaving the detention center, Saber and Ayaka wander through Snowfield in search of allies. Before long, the two entered a forest made home by Lancer, the Servant who recently engaged in a spectacular battle against Archer. Challenged to prove his prowess and determine whether they would make suitable allies, Saber unleashes his Noble Phantasm as Lionheart.

Prior to the battle between Saber and Lancer, Halri Vorzak, a girl who harbors deep hatred for the world of magecraft, summons a Servant of her own. However, what answers her call is an utterly uncontrollable and aberrant Heroic Spirit. As its claws tear through her abdomen, her life begins to trickle away until a lone homunculus reaches out to grasp her dying hand.

To repair their damaged Noble Phantasms, members of Clan Calatin are sent to Caster’s magecraft workshop.

Clan Calatin has arrived at the entrance of the hospital in hopes of executing a rescue mission for Tsubaki.

True Archer, stands before the police force menacingly, as if embodying despair itself.

Many of those involved in the last battle wake up in a peculiar situation, as if nothing had happened.

Cerberus stands before Saber and Ayaka inside the dreamworld.

Francesca and the others descend into a dream realm filled with chaos.

The Holy Grail War: a competition in which Mages summon Heroic Spirits and vie against each other in pursuit of the Holy Grail, a wish-granting machine that can grant any and all wishes. Several years after the conclusion of the Fifth Holy Grail War in Japan, the next war is about to manifest in a place called Snowfield in the western United States. It is a Holy Grail War that is full of false things. Mages and Heroic Spirits have gathered together on a false pedestal. Even though they know that this is a false Holy Grail War, they continue to dance on the pedestal. What is true and what is false will be settled in the next life. They do it not for the Holy Grail but to uphold their own beliefs and nothing more.