

Accompanied by his own familiar, Saber, the notorious mercenary soon finds his greatest opponent in Kirei Kotomine, a priest who seeks salvation from the emptiness within himself in pursuit of Kiritsugu. Kiritsugu now stands at the center of a cutthroat game of survival, facing off against six other participants, each armed with an ancient familiar, and fueled by unique desires and ideals. Solely for this reason, the much hated "Magus Killer" Kiritsugu Emiya is hired by the Einzberns, with marriage to their only daughter Irisviel as binding contract. In spite of that, the wealthy Einzbern family is confident that the Fourth Holy Grail War will be different namely, with a vessel of the Holy Grail now in their grasp. With the promise of granting any wish, the omnipotent Holy Grail triggered three wars in the past, each too cruel and fierce to leave a victor. Alongside the mysterious group calling themselves the Demon Slayer Corps, Tanjirou will do whatever it takes to slay the demons and protect the remnants of his beloved sister's humanity. Consumed by rage and hatred, Tanjirou swears to avenge his family and stay by his only remaining sibling. Worse still, the sole survivor is his sister Nezuko, who has been turned into a bloodthirsty demon.

When he finally arrives back home the next day, he is met with a horrifying sight-his whole family has been slaughtered. On his way back, night falls, forcing Tanjirou to take shelter in the house of a strange man, who warns him of the existence of flesh-eating demons that lurk in the woods at night. One day, Tanjirou decides to go down to the local village to make a little money selling charcoal. Though living impoverished on a remote mountain, the Kamado family are able to enjoy a relatively peaceful and happy life. Ever since the death of his father, the burden of supporting the family has fallen upon Tanjirou Kamado's shoulders.
