How Old Is Ichigo Kurosaki in Sword Art Online Alicization?

Let's clear the air right away: Ichigo Kurosaki is not a character in Sword Art Online: Alicization. He belongs to a completely different anime and manga universe, Bleach, where he is known as a 17-year-old Sub Soul Reaper. While both are incredibly popular series within the anime community, they exist in separate fictional worlds with no crossover between them. So, the question of his age within the virtual realm of Underworld or Aincrad simply doesn't apply.
If you're looking for , we’ve got you covered with everyone who truly shapes this epic narrative. For now, let's set Ichigo aside and dive into the fascinating, complex, and emotionally charged world that is Sword Art Online: Alicization. This guide will serve as your ultimate hub to navigate the "Alicization" arc, connecting you to every crucial detail.

Understanding the "Alicization" Arc: A Dive into SAO's Deepest World

Sword Art Online: Alicization stands as the third anime season in the beloved SAO series, meticulously adapting volumes 9 through 18 of Reki Kawahara's original light novels. It follows the events of Sword Art Online the Movie: Ordinal Scale, taking viewers on an unparalleled journey into a new virtual realm. The arc was split into two main parts, with "Alicization" airing from October 2018 to March 2019, and its intense second half, War of Underworld, concluding in September 2020 after a COVID-19 related delay.
To truly appreciate the depth of this arc, it's worth exploring that unpacks every twist and turn.

The Genesis: Project Alicization and the Soul Translator

At the heart of the "Alicization" arc is Rath Company's groundbreaking Full-Dive technology, the Soul Translator (STL). Far more advanced than its predecessors, the STL isn't just for gaming; it's designed for brain restoration and, more critically, for the development of advanced artificial intelligence. This ambition forms the core of "Project Alicization," Rath's top-secret initiative aimed at creating sophisticated AIs for military purposes, all within a meticulously crafted virtual world known as the Underworld.
For a complete breakdown of this pivotal technology, you’ll want to . Furthermore, to grasp the full scope of Rath's intentions, explore .

Kirito's Unwitting Entry into Underworld

Our protagonist, Kirito, finds himself thrust into this mysterious world after being poisoned by Johnny Black in the real world. To save his life and brain, he's placed into an STL, waking up in Underworld with his memories of the real world initially suppressed. Here, he befriends Eugeo, a young woodcutter with a profound personal quest: to find his childhood friend Alice, who was abducted years ago by the formidable Integrity Knights.
You can learn more about from his real-world trauma to his awakening in Underworld. For , his motivations, and his impact on Kirito, we have a dedicated guide.

The Quest for Alice and Confronting the Axiom Church

Kirito assists Eugeo in his quest, leading them to enroll in the Central Cathedral's Swordcraft Academy. Their journey takes an unexpected turn when they are arrested by none other than Alice herself, now an Integrity Knight. This reveals the sinister machinations of the Axiom Church, the governing body of Underworld, and its ultimate ruler, the Administrator, who erases memories and performs synthetic rituals to maintain control.
To truly grasp the foundational elements of this world, don't miss . For more about the main antagonist of the first arc, dive into .
After escaping imprisonment, Kirito and Eugeo ally with Cardinal, an AI who has been opposing Administrator for two centuries. They ascend the Central Cathedral, battling Integrity Knights who enforce the strict Taboo Index (Code 871). It's during this ascent that Kirito manages to inform Alice of the truth about her past, causing her to break her Taboo seal – a pivotal moment that sparks her true awakening.
The Integrity Knights are central to the initial conflict; for their full story, you can . And of course, the pivotal character whose name adorns the arc has her own story: discover .

The War of Underworld: A Battle for Existence

Just as Kirito defeats Administrator, a new threat emerges: Gabriel Miller's GlowGen Defense Systems attacks the Ocean Turtle facility in the real world, aiming to seize Alice (A.L.I.C.E) and the STL technology. This leads to the epic War of Underworld, where Miller logs in as Dark Emperor Vector, and Vassago (PoH) also joins the fray. Asuna, along with Sinon and Leafa, dive into Underworld to aid Kirito, joining forces against the Dark Territory and an invading army of American players.
The "War of Underworld" arc is a massive storyline filled with sacrifices, betrayals, and incredible power-ups. For the full scope, you��ll need . And to understand the primary human antagonist, read about .
Kirito, previously comatose after a power surge, awakens spurred by a fragment of Eugeo's fluctlight. He decisively defeats Vassago, trapping him eternally within Underworld, causing his real-world body to age rapidly. The war culminates in a final confrontation where Kirito defeats Miller, and Alice safely exits to the real world. Asuna, demonstrating immense devotion, chooses to remain with Kirito, willingly trapped for 200 virtual years as time acceleration is unleashed.

The Aftermath and Future of SAO

Following the tumultuous events, Rinko holds a press conference introducing Alice as the world's first autonomous AI, now implanted into an android. Kirito awakens in the real world, requesting his and Asuna's 200-year Underworld memories be erased. However, a copy of Kirito's fluctlight, created by Higa, seeks out Akihiko Kayaba's help to protect Underworld.
The profound implications of Alice's existence and the advanced AI she represents are explored in .
Years later, Kirito, Asuna, and Alice log back into a future Underworld, which has evolved into a space environment. They are recognized by the descendants of Ronye and Tiese as the legendary heroes: Star King, Star Queen, and Integrity Knight Alice, with a glimmer of Eugeo's spirit still resonating. The Alicization arc showcases a groundbreaking evolution in storytelling for Sword Art Online, pushing boundaries of virtual reality and artificial intelligence. If you're curious about the subtle storytelling differences, you might appreciate understanding .
The journey through Sword Art Online: Alicization is one of the franchise's most ambitious and emotionally resonant, delving deep into philosophical questions about life, consciousness, and the very nature of humanity. It cements its legacy not just as an action-packed adventure, but as a thought-provoking exploration of artificial intelligence and digital existence, far beyond the initial query of a certain Soul Reaper's age.