Fate/stay night: Heaven's Feel III. spring song

Following her return home, Sakura Matou fuses with the shadow after killing her brother, Shinji, for his attempted rape on her. Shirou Emiya later finds Shinji's corpse and is taunted by Zouken Matou for his role in Sakura's corruption, but is saved from Zouken's bug 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 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 when the pain from unwittingly absorbing Berserker's spirit forces her to retreat.

Leaving Kirei for dead, Shirou asks Illya and Rin how to subdue Sakura, where Illya suggests using the weapon of the oldest known magus; the Jeweled Sword Zelretch. Combining their powers, Rin and Illya show Shirou the Tohsaka, Einzbern and Makiri families' recorded memories to copy Zelretch's sword from, in turn showing how the Holy Grail was conceived to reach the "Root" of all knowledge. While recreating the Jeweled Sword, the power of Archer's arm continues to damage Shirou, eroding his memories while swords manifest throughout his body. Meanwhile, Zouken plots to make Sakura his new vessel, revealing his true body is a worm familiar near Sakura's heart. However, Sakura retaliates by absorbing Assassin with the Shadow, before ripping Zouken out of her chest and crushing him.

After a brief confrontation, Shirou convinces Rider that he will save Sakura no matter what, securing her help along with Rin. The group arrive at Fuyuki Cave, where the tainted Holy Grail waits, but Saber Alter bars their way and only lets Rin pass on Sakura's orders. Working together to create an opening, Rider exhausts herself to subdue Saber Alter long enough for Shirou to remorsefully finish off his former Servant. Meanwhile, Rin engages Sakura by using the Jeweled Sword's power to match Sakura's shadows - during which Sakura accuses Rin of abandoning her to the Matou's hellish upbringing. Rin almost kills Sakura by sacrificing the Jeweled Sword but ultimately can't go through with it; sustaining severe injury to embrace Sakura, Rin admits she loves her sister and regretted never trying to save her. Overcome by remorse, Sakura breaks free of the shadow's control long enough for Shirou to reach her, trace Caster's Rule Breaker and sever her link to it.

Despite the shadow being purged from Sakura, the Holy Grail - corrupted by an evil entity known as Angra Mainyu, who used the shadow as an avatar - still tries to emerge. Rider takes Rin and Sakura to safety while Shirou stays to stop the entity's rebirth, but a dying Kirei interferes as he believes Angra Mainyu's birth may show his purpose in life. The two near-dead men engage in a vicious fistfight and Kirei is eventually overcome, dying as he declares Shirou the winner of the Holy Grail War. Before Shirou can destroy the grail at the cost of his life, Illya appears stating she will protect her brother and, despite Shirou's tearful pleas, she sacrifices herself to invoke the Heaven's Feel ritual. Stopping the grail's rampage and splitting Shirou's soul from his dying body, Illya briefly reunites with her mother Irisviel's spirit before passing on.

A few months after the Holy Grail War's end, Rin and Sakura restore Shirou's soul after it was recovered by Rider, giving him an artificial body provided by Touko Aozaki. Resuming their relationship, Shirou and Sakura - along with Rin, Taiga and a now-incarnated Rider - go to see the cherry blossoms as Shirou promised.

Heaven's Feel III. spring song is produced by ufotable, directed by Tomonori Sudō and written by Akira Hiyama and featuring music from Yuki Kajiura.[2] The first visual of the film was released in October 2019.[3] Subsequent ones were publicly distributed on October 28, 2019[4] and November 17, 2019.[2] Its March 28, 2020 release date was confirmed in a trailer featuring the main theme, Aimer's "Haru wa Yuku" (春はゆく, "Spring Goes By").[5][6]

Tomonori Sudō expressed relief when the film was released, favoriting many scenes including Rider's fight against Saber Alter, the relationship between Sakura and Rin, Illya's new design among others. The cast praised Aimer's performance for her song during the release of the movie.[7]

The film was originally scheduled to premiere in Japan on March 28, 2020, but it was postponed to April 25, 2020 and then again to August 15, 2020, due to concerns over the COVID-19 pandemic.[8] Aniplex of America originally planned to present a preview screening of the film in the United States on April 17, 2020 at the Orpheum Theater in Los Angeles,[9] and to begin wider theatrical screenings across the United States starting on May 7, 2020.[10] However, due to concerns over the pandemic, the U.S. premiere was cancelled, and all North American theatrical screenings were postponed to November 18, 2020.[11][12]

The film's opening topped the Japanese box office, 270,000 tickets sold for a gross of 474,890,600 yen ($4.48 million) in its opening weekend.[13] The movie made 1 billion yen at the Japanese box office in 11 days, reaching the milestone quicker than the first two films, and sold a total of 620,000 tickets in that time.[14] The film went on to earn more than 1.9 billion yen ($18 million) by October 15, 2020 in Japan, until December 31, he grossed 1.95 billion yen ($ 18.8 million) in Japan, making it the highest-grossing film in the Heaven's Feel trilogy.[15]

The film went on to earn in South Korea $635,049, in Australia $124,140, in the New Zealand $17,588, in Hong Kong $259,051

In the United States, the film opened in 10th place at the box office, with estimated earnings of $200,000 from a limited release in 304 theaters.[15][16]

• Official website (in Japanese)
• Official English website
• Fate/stay night: Heaven's Feel III. spring song (movie) (anime) at Anime News Network's encyclopedia