Fate/stay night: Heaven’s Feel II. Lost Butterfly

A determined young mage who vows to protect Sakura, even at the expense of his own ideals. After Saber’s disappearance, Shirou is effectively cut from the Holy Grail War, but he remains steadfast. He is injured in battle and loses his left arm, only to be saved when Archer sacrifices his own arm and transfers it to Shirou, merging their fates.

Kidnapped and burdened by the Matou Crest Worms, Sakura struggles with growing control and a sense of burden toward Shirou. Her trauma, jealousy, and hidden strength push her toward a fateful transformation as the Grail’s vessel. Her fate becomes increasingly tied to the Grail’s power and the conflicts around her.

A powerful Servant whose protective instinct toward Sakura clashes with the Grail War’s brutal demands. Her petrifying gaze and formidable presence complicate alliances and battles as she remains loyal to Sakura.

A sharp-witted magus ally who strategizes with Shirou and Illya, navigating moral lines as Sakura’s fate becomes central. Her practical approach complements Shirou’s ideals, and she tempers impulses with calculated plans.

Shirou’s enigmatic future self bound to fight alongside him, ultimately sacrificing for Shirou’s sake by giving up his own arm to save his life. His presence challenges Shirou’s beliefs about ideals and strength.

A key ally who manipulates and mobilizes forces against Zōken, while seeking to shield Shirou and Sakura through shifting loyalties. Her actions influence the war’s balance and the fates of those around her.

A priest who probes Sakura’s situation and reveals the truth about her bloodline and Crest Worms, weaving moral ambiguity into the war’s broader questions. He uses the situation to explore deeper motives and manipulation.

The Matou patriarch whose schemes with the Grail’s power twist Sakura’s fate and threaten everyone around her. His plans intersect with the history of the Holy Grail and the Matou family’s legacy.

A formidable Servant whose arrogance and power escalate the conflict. His confrontations with other Servants intensify the Grail War’s stakes and contribute to the story’s dark turn.

Sakura’s abusive adoptive brother whose actions and cruelty contribute to Sakura’s trauma and the escalating danger surrounding the Grail War.