Fate/stay night: Heaven’s Feel I. Presage Flower

Shirou quits the school's archery club after a training injury and begins receiving visits from Sakura at his home under Taiga's care. That same night, he witnesses a clash between two mysterious warriors. Saber, the armored swordswoman, protects him and calls him Master, revealing a connection to a world he never knew existed.

Rin Tohsaka drags Shirou into the reality of the Holy Grail War by taking him to Kirei Kotomine, where he learns he has become a Master with Saber as his Servant. Archer is revealed to be Rin's Servant as well, binding their fates together. The revelation launches him into a dangerous new battleground.

On the way back from Rin's revelation, Illyasviel von Einzbern and her Rider Berserker assault Saber. Shirou sacrifices his own safety, injuring himself to shield Saber, proving his resolve. Illya withdraws after witnessing Shirou's commitment to Saber.

Saber engages Rider in combat and defeats him, uncovering Shinji Matou as the Rider's Master. Shinji's grandfather Zouken ridicules him for failing, and Shinji denies Sakura's involvement in the war as he and Zouken depart. The civil conflicts begin to spill into the students' lives.

Saber takes shelter at Shirou's home, and Shirou and Rin discuss a spike in illness plaguing citizens. They resolve to investigate the cause and stop any further harm. To keep Sakura safe, Shirou persuades her to stay at the Emiya home under Saber's protection.

At Ryuudou Temple, Kuzuki and his Servants, Caster and Assassin, confront a mysterious threat as True Assassin bursts from Assassin and slays them. The battlefield confirms the Grail War's deadly unpredictability and raises the stakes for Shirou and Rin.

Lancer is ordered to track down the new Assassin. After a long chase, Assassin lures Lancer into a lake, where the shadow devours him. The loss marks another harsh blow in the ongoing war.

Shirou and Rin confront Zouken, who is controlling Caster's corpse like a puppet. The shadow appears, devours Caster, and Zouken reveals his true form as Crest Worms before retreating. The war's hidden masters reveal their ruthlessness.

The shadow attacks Rin, forcing Shirou to intervene and be injured while shielding her. The attack demonstrates the shadow's danger to both masters and city, intensifying the stakes of the Grail War.

Sakura confronts Saber about Shirou's safety, seeking reassurance about his well-being. As Shirou recovers, he and Sakura reminisce about their pasts, and she asks him to stop her if she ever does something wrong. A deep bond forms as they face the encroaching danger.

Shirou meets Kirei Kotomine, who reveals that Lancer is dead and acknowledges himself as Lancer's Master. He warns that the shadow is a threat to the entire city, but Shirou refuses to trust him or join forces. This encounter deepens the moral ambiguity surrounding the Grail War.

In the climactic confrontation at Ryuudou Temple, Assassin ambushes Saber and lures her into the shadows while Zouken assaults Shirou. The shadow captures Saber and Shirou's command spells vanish, leaving them vulnerable. Rider arrives at the last moment to drive away the attackers, granting a narrow window for retreat.

Rin Tohsaka and Archer break into Matou basement and discover it is infested with Crest Worms, revealing the scale of Zouken's manipulation. The discovery ties the darker secrets of the Matou lineage to the Grail War's broader conspiracy. The revelation heightens the sense of impending disaster for Shirou and Rin.

Zouken explains to Assassin that Crest Worms are essential to his survival, revealing his willingness to sacrifice others to sustain himself. He demonstrates by having his insects devour a woman in an alley, underscoring the brutal calculus behind the war. The revelation cements the villainy behind the Masters' schemes.

After the night's ordeals, Shirou returns to the Emiya residence where Sakura shows genuine concern for his injuries and well-being. Their bond remains a beacon of hope amid the war's horrors as they face an uncertain future. The scene closes on a note of fragile care and resilience.