Fate/Stay Night: Réalta Nua

In the city of Fuyuki, a secret war is fought in shadow every few decades. Seven mages known as Masters summon legendary warriors from across history as Servants and pit them against one another in a battle royale called the Holy Grail War. The prize is the Holy Grail itself — an artifact capable of granting any wish. Emiya Shirou is a high school student with no business being involved in any of this. One evening he stumbles onto a clash between two Servants. Caught in the fallout, he is mortally wounded and only survives because Tohsaka Rin intervenes, saving him with her Servant Archer. In the chaos, Shirou accidentally completes a summoning ritual he did not intend, calling forth his own Servant: Saber, a composed and formidable knight whose history is not what it first appears. Thrown into the War they entered uninvited, Shirou and Saber navigate alliances, confront opponents whose goals and secrets cut in every direction, and push toward a truth neither of them fully understood when they began.