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A re-telling of the original 2013 anime series, recounting the events surrounding bespectacled beauty Mirai Kuriyama and an immortal, half-human boy named Akihito Kanbara. As a Spirit World warrior, Mirai uses the rare gift (and curse) that is using her blood as a weapon to slay supernatural monsters known as youmu.
Two years ago, the Nase siblings met Akihito for the first time when Hiroomi and Mitsuki are sent to subjugate the half-yomu.
Years after having been exiled from the Kannagi household for being unable to utilize their fire magic, Kazuma returns to Japan, only to discover that the Kannagi family's very existence is threatened. Unknown to them, during his absence, he had become a Contractor and thus acquired a vast strength in wind magic. Not showing any remaining contempt for them, he offers to help solve the Kannagi household’s problems in return for large sums of money. Together with his younger brother Ren and the feisty heir to the Kannagi household, Ayano, he fights to protect those he cares about... for a price!
In a world where supernatural beings known as youmu are hunted by Spirit World Warriors, Akihito lives an eventful life. He’s a half-breed from a human mother and a youmu father, and is immortal - a fact that saves his life on a regular basis, for his bespectacled classmate Mirai can’t seem to stop stabbing him in the chest. She’s a Spirit World Warrior with the power to control her blood, which she manifests into a sword; and with low self esteem about her abilities to hunt youmu, Mirai constantly uses Akihito as target practice. In hopes of being left alone, Akihito must now help Mirai gain confidence to take down sinister youmu.
One year after the events of the original series. Mirai has lost her memories, and Akihito separates himself from her in an attempt to protect her from her painful past. Despite the heartache it brings him, Akihito is determined to protect Mirai's happiness as she moves through life as a normal human being - but when dark forces stir, she may be forced back to the front lines in the fight against the youmu, and re-open the wounds of her past.
Mirai, Mitsuki, and Ai sing the sing Yakusoku no Kizuna, and preform it along with their backup dancers Hiromi and Akihito.
Ten years before Shirou Emiya's and Saber's fateful meeting, Japan is the stage for the fourth Holy Grail War. Seven Masters, each with his own dreams, step forward to win the boon of the mystic relic. Into this fray comes Kiritsugu Emiya, the enigmatic "Mage Killer" who wants to use the Grail to make a better world. Can he, paired with the indomitable Saber win the War? Or will he fall to the ambitions of the other mages?
The Holy Grail War wages unabated. The Servants face the impossible task of allying against Caster to win additional command spells, while beneath this thin veneer of amity, their Masters plot to destroy each other. Saber herself must battle not just the monsters bearing down upon her but the doubts inside her own heart about the path of valor she has chosen. After all, what is the place of ancient righteousness in a modern world where the only rule is to win at any cost? As the Holy Grail War enters its deadliest phase, the world becomes witness to both inconceivable horrors and incredible heroism - but the question remains which will prevail.