All You Need Is Kill

• 1. Introduction

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  All You Need Is Kill, a Japanese light novel by Hiroshi Sakurazaka, begins with a young recruit named Keiji Kiriya dying on his very first sortie. Moments before, he had killed a Mimic that looked different from the rest. Mimics are the extraterrestrials who have laid siege to Earth. Then Keiji opens his eyes, and it is the day before the battle. His body is whole, his orders are unchanged, and nobody around him seems to know anything has happened. Why does this one soldier keep being thrown backward in time? What do the Mimics want, and what do they know that humanity does not? And what would a person have to become, or give up, to finally break free of the day?

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• 2. Dying Into Skill

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  After several dozen loops, Keiji Kiriya begins to see a pattern in his own predicament. His fate looks a lot like that of Rita Vrataski, the famous ace of the United Defense Force. Until then, each reset has simply made him a better fighter. He is a new recruit with a powered exoskeleton, yet the UDF is still losing its war. Repetition lets him learn what no training course could teach.

  The standard boltgun teaches him a hard lesson. It burns through its ammunition quickly and jams easily, so a soldier who relies on it is left empty-handed at the worst moments. Rita, by contrast, prefers a battle axe. Keiji uses his knowledge of how the day unfolds to get close to her and to her mechanic. From the mechanic he obtains a copy of her enormous axe, and he practices until he handles it well. The axe was Rita's trademark, but the woman who swung it first carried a past that nobody on the front line knew.

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• 3. The Ace and Her Crew

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  Among ordinary soldiers, Rita Vrataski goes by the name "Full Metal Bitch." Highly decorated and peerless in combat, she is treated as a hero by the entire world. Yet her name is a false identity. She used it to join the UDF at a young age, after Mimics killed her parents. She too has lived through a loop, and that experience is the source of both her skill and her reputation. She is said to hate the color red and prefer blue. Even so, she painted her exoskeleton red, because a bright target draws enemy attention away from others.

  The people around her are drawn with equal care. Shasta Raylle Carter is her mechanic, a bespectacled Native American woman who collects Gashapon toys. She developed the large battleaxe that Rita carries and that Keiji later inherits. Bartolome Ferrell, Keiji's platoon sergeant, is a fitness-obsessed man of Brazilian and Japanese descent who looks after his subordinates. In the canteen, Rachel Kisaragi earns the friendship of the troops with her cooking and her looks. Only Rita, however, can recognize what Keiji is going through, and once she does, she tells him how the enemy actually works.

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• 4. How the Mimics Cheat Time

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  Rita's explanation to Keiji turns the loop from a curse into a puzzle. When a Mimic dies, it can send a signal back into the past. That lets the Mimics see how a battle will end and change their behavior to avoid defeat. Each group of Mimics contains one nexus, which is able to make the day loop, along with several antenna Mimics. All of them can signal the reset. Keiji became trapped after he came into contact with one such antenna.

  The way out, which Rita herself once took, is to kill every antenna first and then the nexus. The task is harder than it sounds, because the Mimics keep adapting to Keiji's attacks. He and Rita succeed in destroying the nexus, yet the loop resets anyway and Rita forgets everything. Keiji has to explain it all again. She listens, then admits that they must have missed one antenna. So on the 160th loop, they set out to hunt the antennae once more.

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• 5. The Hundred and Sixtieth Loop

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  On the 160th loop, the plan works until the two of them are out of sight of allied forces. Then Rita turns on Keiji. She has a hypothesis about what the loop has done to them. Being trapped, she argues, has changed their brains, so that both of them now resemble the antenna Mimics. One of them must die before the nexus is killed, or the loop will never end.

  Neither wants the fight, and they begin it reluctantly. Keiji mortally wounds Rita and stays beside her as she dies. He admits that he has been developing feelings for her. She answers by telling him to win the war quickly, so that nobody else suffers what they did. She also reveals that she knew this battle was inevitable from the moment they met, and that she knew her own fate. Keiji then slaughters the remaining Mimics and destroys the nexus. Weeks afterward, he is celebrated as a new hero of the UDF while he quietly thinks about the sacrifice that victory required. He paints his exoskeleton blue in her memory, and the troops start calling him "Killer Cage."

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• 6. A Gamer's Account

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  The seed of the novel was an online account written by a video game player. The writer described how restarting a game after the character died allowed improvement through trial and error. Sakurazaka read this and imagined a hero who ends up "being played over and over." Before writing, he studied other fiction built on time loops, including the film Groundhog Day.

  Shueisha published the book under its Super Dash Bunko imprint on the 18th of December 2004, with illustrations by Yoshitoshi Abe. A republished edition followed on the 19th of June 2014. English readers got their first edition from Viz Media, under its Haikasoru imprint, on the 21st of July 2009. On the 29th of April 2014, Viz re-released the novel in North America under a new title, Edge of Tomorrow, the same name as the film.

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• 7. Many Retellings

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  The year 2014 brought the story to several new formats at once. A manga adaptation ran from the 9th of January to the 29th of May 2014. Takeshi Obata provided the illustrations, Ryosuke Takeuchi the storyboards, and Yoshitoshi Abe the character designs. It appeared in Weekly Young Jump in Japanese and in Weekly Shonen Jump in English. Two collected volumes arrived on the 19th of June 2014, and Viz Media published an English omnibus on the 4th of November 2014. Meanwhile, Nick Mamatas and the artist Lee Ferguson produced a separate American graphic novel, released through Haikasoru on the 5th of May 2014.

  The best-known retelling is the film Edge of Tomorrow, directed by Doug Liman and produced by Warner Bros. Pictures and Village Roadshow. Tom Cruise plays William Cage, the counterpart of Keiji, and Emily Blunt plays Rita Vrataski, whose nationality becomes British. The setting moves to Western Europe, where the battle is a strike into Normandy that begins at Heathrow Airport. The ending differs significantly from the novel's. Shasta becomes the male Dr. Carter, played by Noah Taylor, and Sergeant Ferrell becomes an American played by Bill Paxton. The film reached British theaters on the 30th of May 2014, North America on the 6th of June, and Japan on the 4th of July.

  An anime film was announced on the 13th of March 2025. Studio 4°C animated it for Warner Bros. Japan under director Kenichiro Akimoto, and it retells the story from a different point of view than either the novel or the American film. It premiered on the 9th of June 2025 at the Annecy International Animation Film Festival. Japanese theaters opened it on the 9th of January 2026, with the theme song "Tsuretette" performed by Akasaki. GKIDS licensed it for North America, the United Kingdom, Ireland, Australia and New Zealand, and the North American release followed on the 16th of January 2026.

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• 8. Praise and Nominations

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  Fellow novelists were among the first to notice what Sakurazaka had done. Yasutaka Tsutsui and Chōhei Kanbayashi both praised the book, which became his breakthrough in science fiction. In 2005 it was nominated for Best Japanese Long Work at the 36th Seiun Awards.

  The recognition did not stop with the novel. A decade later, the manga adaptation was nominated at the 2015 Eisner Awards, in the category for the best U.S. edition of international material from Asia.

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