Anime adaptations often take detours from their source material, but few divergences have sparked as much debate as Tokyo Ghoul √A (often called Root A). This second season of the Tokyo Ghoul anime departed sharply from Sui Ishida’s manga, creating an original storyline that left viewers both intrigued and bewildered. For fans trying to piece together the complete picture, understanding where Root A sits in the broader canon and timeline is essential. The arc acts as a grim interlude between Kaneki’s transformation and the sprawling narrative of Tokyo Ghoul:re, but its relationship to the manga’s events is deliberately fractured. This article charts Root A’s chronological placement, examines its deviations, and explores why it remains a significant, if controversial, chapter in the anime’s history.

The Foundation: Tokyo Ghoul Season One and the Manga

Before unpacking Root A, it’s vital to recall how closely the first season of Tokyo Ghoul mirrored the manga. Produced by Studio Pierrot and directed by Shuhei Morita, the initial 12 episodes adapted the early volumes almost panel for panel. The story introduced Ken Kaneki, a bookish college student who becomes a half-ghoul after a failed date with the predatory Rize Kamishiro. Through Kaneki’s eyes, viewers were immersed in the hidden world of ghouls—beings who survive by consuming human flesh—and the fragile peace maintained by the Commission of Counter Ghoul (CCG).

The first season reached its climax with Kaneki’s abduction by the ghoul organization Aogiri Tree and his brutal torture at the hands of Yamori (Jason). This trauma cemented Kaneki’s psychological break, his hair turning white and his acceptance of his ghoul nature. In the manga, the post-torture story leads to Kaneki forming his own anti-Aogiri group and a multi-layered raid on Kanou’s lab, the driving force behind half-ghoul experiments. However, the anime’s second season, subtitled “√A” (pronounced “Root A”), chose a radically different path. While the first season is firmly canonical to both manga and anime timelines, Root A exists in a liminal space—a creative reimagining rather than a faithful adaptation.

The Divergence: Why Root A Told a Different Story

The decision to create an anime-original narrative for the second season was shaped by several factors. Director Shuhei Morita and writer Chūji Mikasano conceived Root A with input from Sui Ishida himself, who provided draft storyboards and an outline for an alternate scenario. The aim was to craft a self-contained anime conclusion that would still resonate emotionally, given the uncertainty of a third season at the time. In interviews, the production team explained that they wanted to explore Kaneki’s psychological descent from a different angle, focusing on his isolation and the severe consequences of his choices.

The most jarring deviation occurs right at the start of Root A: Kaneki, rather than rejecting Aogiri, chooses to join them. He does so not out of loyalty but as a means to become stronger and protect those he cares about, believing that infiltrating the enemy is his only path. This fundamental shift alters the entire dynamic. In the manga, Kaneki’s refusal to align with Aogiri leads to the formation of his own group and the exploration of the ghoul underground. The anime, by contrast, keeps Kaneki inside Aogiri’s ranks, turning his arc into a slow-burn tragedy of lost identity.

Major manga arcs—the raid on Kanou’s laboratory, the deeper investigation into ghoul biology, and the confrontations with the Clowns—were either heavily condensed or removed. Instead, Root A invents sequences such as the Cochlea infiltration and the final battle with the CCG at Anteiku, weaving in fragments of manga material with original connective tissue. The result is a season that feels familiar yet fundamentally its own beast.

Plot Summary and Key Events of Root A

Root A opens with Kaneki’s acceptance into Aogiri Tree, a move that shocks his friends at Anteiku. From here, the season threads together several major plot points:

  • Aogiri’s raids and counter-attacks: Kaneki participates in Aogiri operations, including attacks on CCG facilities and the Cochlea ghoul prison, all while secretly hoping to dismantle the organization from within.
  • The Cochlea infiltration: Altered from its manga counterpart, this storyline sees Kaneki, Ayato, and others breaking into the prison. It introduces key characters like Roma and the jailer Shinme Haisaki, but streamlines events for dramatic effect.
  • CCG’s Owl Suppression Operation: The grand finale is a massive CCG assault on Anteiku, led by the Special Class investigators. The operation targets the One-Eyed Owl (Eto Yoshimura) and her father, Kuzen. Kaneki races to protect his old home, setting the stage for a devastating confrontation with his ally-turned-nemesis, Amon Koutarou.
  • Kaneki vs. Amon: Their climactic battle in the snow-covered streets near Anteiku becomes the emotional center of Root A. Both men, burdened by their beliefs, fight with desperation. The outcome, while visually striking, leaves Kaneki carrying Hide’s dying body to the CCG—a sequence unique to the anime that cements Kaneki’s self-destruction.

Throughout these events, Root A weaves in quieter moments: Touka’s anguish as she watches Kaneki drift away, Shuu Tsukiyama’s obsessive desire to consume Kaneki, and Hideyoshi Nagachika’s quiet investigation that ultimately saves Kaneki’s humanity. These character beats, while sometimes truncated, give the season its emotional weight.

Character Arcs Under the Microscope

Kaneki Ken: The Hollow Protagonist

In Root A, Kaneki is less a hero and more a specter haunted by his own contradictions. His decision to join Aogiri is an act of self-negation; he tells himself he is protecting Anteiku by keeping his distance, but the truth is he has given up on the person he once was. Kaneki’s internal monologue, sparse compared to the manga, underscores his descent: “I’m not the protagonist of a novel or anything… I’m just a college student who likes to read, like you could find anywhere. But… if, for argument’s sake, you were to write a story with me in the lead role, it would certainly be… a tragedy.” This line, borrowed from the manga’s later chapters and placed in the anime’s ending, foreshadows the inevitable collapse. Root A drives Kaneki to the brink, where even his final act—carrying a dying Hide to the CCG—is a surrender.

Touka Kirishima and the Anteiku Family

Touka’s arc in Root A is one of quiet resilience. With Kaneki gone, she shoulders the burden of protecting Anteiku, all while wrestling with her feelings of abandonment. The anime expands her interactions with her brother Ayato, tying their sibling conflict directly to the larger Aogiri threat. By the finale, Touka’s determination to save Kaneki—even as he rejects her—mirrors the manga’s themes but places her in a more passive, tragic position.

Amon Koutarou and the CCG Perspective

Root A devotes significant screen time to the CCG investigators, particularly Amon and his new partner, Akira Mado. Amon’s unwavering sense of justice is tested as he confronts the ghouls who are not simply monsters but individuals with families and pain. His rivalry with Kaneki, forged through brutal combat, becomes the series’ moral crucible. Akira, haunted by her mother’s death and her father’s obsession, offers a poignant parallel to Kaneki’s own loss of innocence. The anime-original confrontation at Anteiku pushes Amon to question the very system he serves, a vital setup for his role in Tokyo Ghoul:re.

Hide’s Sacrifice

Perhaps the most controversial character moment in Root A is Hide’s fate. In the manga, Hide’s encounter with the wounded Kaneki is ambiguous, with implications of a terrible sacrifice. The anime makes that sacrifice explicit: Hide allows Kaneki to consume part of him to survive, then later, in his dying moments, urges Kaneki to go home. This dramatic license amplifies the tragedy but removes the ambiguity that later drove Kaneki’s quest in :re. It is a self-contained tragedy that, for anime-only viewers, closes the book on their friendship in the most heartbreaking way.

Where Root A Fits in the Series Timeline

Establishing a precise timeline for Root A is essential for understanding its connective tissue—or lack thereof—to the broader series. Chronologically, the season picks up immediately after Kaneki’s torture and his hair turning white, placing it shortly after the Aogiri arc of the first season. The events span roughly the same period as the manga’s middle volumes (roughly volumes 8 through 14), but with significant rearrangement.

Anime timeline summary:

  • Tokyo Ghoul (Season 1): Kaneki’s transformation, the Doves’ introduction, and the Aogiri abduction.
  • Tokyo Ghoul √A (Root A): Kaneki joins Aogiri, Cochlea prison break, the Anteiku extermination operation, and Kaneki’s final confrontation with Amon.
  • Tokyo Ghoul:re (anime): Two-year time skip. The CCG’s Quinx Squad is formed. Kaneki (now Haise Sasaki) leads the squad, with no memory of his past.

For viewers who watched the anime in release order, Root A directly precedes :re. However, the :re anime notoriously struggled because it reverted to the manga’s continuity while barely acknowledging Root A’s original events. Characters like Hide reappear with manga-accurate, non-lethal outcomes, causing confusion. In the manga timeline, the events covering Kaneki’s journey after torture, his formation of a group, the Kanou lab raid, and the Anteiku raid occur in a very different sequence and with fundamentally different motivations. Thus, Root A should be treated as anime-canon for the visual adaptation, while the manga remains the authoritative source.

Thematic Resonance: Tragedy and Moral Ambiguity

Despite its narrative departures, Root A stays faithful to Tokyo Ghoul’s core themes. The subtitle “√A” (Root A) itself is a mathematical symbol that implies an alternative solution, a fitting metaphor for the season’s existence. The series continues to probe the question: What is a monster? Kaneki’s descent into Aogiri, however misguided, externalizes his belief that to protect the innocent, one must become a monster. This ethical murkiness is reflected in the CCG’s own brutality; the Anteiku raid is not a heroic operation but a slaughter that reveals the Commission’s one-sided definition of justice.

Root A also leans heavily into the concept of a “tragedy” as Kaneki’s own words frame the narrative. Every choice leads to loss. The season functions as a long, mournful low before the eventual rebirth of Kaneki as Haise Sasaki. While the manga offers moments of hope and community even in dark times, Root A strips most of those away, delivering a consistently somber tone that some fans found exhausting but others saw as a bold, artistically coherent vision.

Connections to Tokyo Ghoul:re and the OVAs

Root A attempted to provide a bridge into Tokyo Ghoul:re, but the bridge was hastily constructed. Several key elements were carried over:

  • The existence of the One-Eyed Owl (Eto), whose role as the mastermind behind Aogiri is revealed.
  • Kaneki’s mental and physical devastation, which logically leads to his capture by the CCG and transformation into Haise Sasaki.
  • The fractured state of Anteiku and the scattering of its members.
  • The death of investigator Kureo Mado in season 1, which fuels Akira’s character throughout Root A and :re.

However, because the :re anime chose to follow the manga’s continuity, it ignored Root A’s ending for Hide, forcing a confusing retcon. For viewers who wish to see a smoother narrative, the Tokyo Ghoul OVAs—Tokyo Ghoul: Jack (which explores Arima’s past) and Tokyo Ghoul: Pinto (a side story about Shuu Tsukiyama)—serve as prequels that fit both anime and manga canons without contradiction. Understanding these side stories can enrich the timeline, though they are not required viewing to appreciate Root A’s place.

Reception and the Canon Debate

When Root A aired in 2015, it prompted a firestorm among manga readers. Many lamented the exclusion of fan-favorite moments, such as the full Kanou lab arc and Kaneki’s centipede metaphor. Critics pointed to pacing issues and a perceived lack of payoff for certain subplots. Yet, Root A also won defenders who admired its aesthetic—the chilly color palette, the Hauntingly beautiful soundtrack by Yutaka Yamada, and the willingness to give Kaneki a tragic, conclusive arc in a medium where heroes often survive against all odds.

From a canonicity standpoint, Sui Ishida’s own stance is nuanced. He provided the alternate draft but has consistently stated that the manga is the primary work. For the anime’s universe, Root A is the official second season, but it does not overwrite the manga’s story. Ultimately, Root A can be considered a companion piece rather than a replacement. As Anime News Network’s review noted, the season “feels less like a betrayal and more like a what-if story that sheds light on Kaneki’s psyche from an unusual angle.”

For completeness, fans often consult detailed timeline resources. The Tokyo Ghoul √A Wikipedia entry catalogues the episodes and original storyboards, while CBR’s breakdown of the anime vs. manga timeline clarifies where each arc diverges. Interviews with director Shuhei Morita, archived on Anime News Network, offer behind-the-scenes insight into the creative decisions. Reading these alongside a rewatch can illuminate why Root A took the path it did.

Conclusion: An Imperfect but Essential Interlude

Root A may not provide the canonical blueprint for Kaneki’s journey, but it captures the emotional essence of his fall with unflinching grimness. Placed squarely between the innocence of the first season and the twisted rebirth of :re, it serves as the dark heart of the anime timeline—a reminder that sometimes the story you thought you were watching is not the one the characters themselves would tell. For those willing to view it as an alternate “root,” the arc enriches the overall Tokyo Ghoul experience, filling the timeline with a tragedy that, while divergent, remains hauntingly true to the series’ soul.