Fate/stay night: Heaven’s Feel III. spring song is a Japanese anime fantasy film produced by ufotable and directed by Tomonori Sudō. The story continues immediately from the events of Fate/stay night: Heaven’s Feel II. lost butterfly, and is the final installment in theFate/stay night: Heaven’s Feel trilogy. It premiered in Japan on August 15, 2020 and in the United States on November 18, 2020.
Following her return home, Sakura Matou fuses with the shadow after killing her brother, Shinji, for his attempted rape of her. Shirou Emiya finds Shinji’s corpse and is taunted by Zouken Matou for his role in Sakura’s corruption, but is saved from Zouken’s insect familiars by Rider.Zouken sends the corrupted Sakura to kidnap Illyasviel von Einzbern – to be a vessel for the Holy Grail like her mother was – and she attacks the Emiya household with Saber Alter, defeating her sister Rin Tohsaka. Illya surrenders to save everyone and, although bound to protect Shirou by Sakura’s final command spell, Rider refuses to fight Sakura directly, so Shirou reluctantly asks Kirei Kotomine for help.
Raiding the ruined Einzbern castle, Kirei engages Zouken and his Servant Assassin while Shirou rescues Illya, but Sakura sends a now-corrupted Berserker to chase them. Despite knowing it will eventually kill him, a desperate Shirou unseals Archer’s transplanted left arm, replicating Berserker’s weapon and strength with Archer’s magic to defeat him. Before dying, a now-sane Berserker entrusts Illya’s safety to Shirou. Kirei drives off Assassin by destroying Zouken’s body, recalling his wish for the Grail – to learn why he, a “twisted” person who is only happy when others suffer, exists. Sakura confronts Kirei and destroys his artificial heart from the last Holy Grail War, but fails to finish him off when she is forced to reabsorb the defeated Berserker.