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Sword Art Online Alicization: War of Underworld poster
23 episodes

Sword Art Online - Sword Art Online Alicization: War of Underworld

First aired Oct 13, 2019Season 4

Time has passed since Kirito defeated the pontifex. While Bercoulli seeks to rebuild and bolster the defenses of the human lands in anticipation of an assault by the forces of darkness, Alice fears for the catatonic Kirito's safety and so relocates to a cabin near Rulid. She may not be accepted in the village, but at least she's near her sister Selka as she looks after Kirito. Though she feels that she cannot swing her sword anymore except to cut down trees, an attack on Rulid may force her to act anyway.

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Reviews

Community reviews for Sword Art Online, shown here with its season details.

S

Shintaro Muraseh

May 31, 2021
10.0

First of all, this series was massive, both in terms of length and story. Maybe I feel this because I watched the whole series too fast (May 6th, 2021 ~ May 31st, 2021). Although, I still feel it was too fast and short. This series has become one of my favorite anime! I watched the whole series on Crunchyroll. I was so annoyed by the advertisement for SAO while watching another anime on CR, however, I liked the animation pictures (I love _A-1 Picture_'s anime haha). That was my trigger. I know there are complaints about the story; even my sister did. I half forced her to watch this series just because I wanted to share my excitement (ahh, bad brother...). Although, luckily, she was also enjoying the series up until season 2. I know there was a major turning point in the middle of season 1. I remember I was also the one who didn't have a good review for season 2 (although it was always over 3.5/5). But I really don't know how better it could be. I was first thinking that the Aincrad arc should have been longer; however, after watching until Alicization War of Underground, I think it was the right length. I might have stopped watching the whole series. I usually don't watch these "fighting" or "action" anime, instead, I watch more romcom and comedy. That is why maybe I have a different perspective than others who usually watch this kind of anime. But now, after watching every SAO episode I can watch, I feel I lost something big in my heart that was holding myself these days. I really hope I can watch the next movie ("_Progressive_") before this feeling goes away. How was my first English review? (I am Japanese mother tongue) I hope I am not annoying haha...

Episodes

In the Far North still

Episode 1

In the Far North

8.8
Oct 13, 201923 min16 votes

Six months have passed since the fierce battle against Administrator. Alice has brought Kirito to her childhood home, Rulid Village, where they live peacefully. Gazing out at the world that she saved with Kirito, Alice reflects on all that’s happened.

Raids still

Episode 2

Raids

8.6
Oct 20, 201923 min14 votes

A force from the Dark Territory is attacking Rulid Village. Though she’d lost her purpose in battle, in order to fight for her family, and for the people that Kirito and Eugeo tried to protect, Alice takes up the Osmanthus Blade once again!

The Final Load Test still

Episode 3

The Final Load Test

8.1
Oct 27, 201923 min14 votes

The mysterious group that attacked the Ocean Turtle turns out to be a secret unit under orders from the U.S. National Security Agency. And its leader, Gabriel, has battled Kirito and Sinon before.

Dark Territory still

Episode 4

Dark Territory

8.1
Nov 3, 201923 min14 votes

Shasta, commander of the Dark Territory's dark knights, had intended to use Administrator's death as a chance for peace with the Human Empire. But his plans are thwarted by Emperor Vecta's return to the land of darkness.

The Night Before Battle still

Episode 5

The Night Before Battle

8.3
Nov 10, 201923 min12 votes

Resolved to fight for humankind, Alice joins the forces of the Human Empire, bringing Kirito with her. But while the forces of darkness boast overwhelming numbers, only thirteen Integrity Knights are available to fight for the Human Empire.

Battle of the Knights still

Episode 6

Battle of the Knights

8.6
Nov 17, 201923 min12 votes

The Final Load Test has begun, and the Eastern Gate has collapsed. Incited by Gabriel, now Emperor Vecta, the massive army of the land of darkness pushes on towards the Human Empire.

Stigma of the Disqualified still

Episode 7

Stigma of the Disqualified

8.5
Nov 24, 201923 min11 votes

Integrity Knight Renly Synthesis Twenty-Seven, in battle for the first time, flees his position, allowing goblins from the forces of darkness to infiltrate to the tent where Kirito is.

Blood and Life still

Episode 8

Blood and Life

8.1
Dec 1, 201923 min12 votes

The powerful formal art unleashed by the Integrity Knight Alice inflicts severe casualties on the forces of darkness. Alice encounters an enemy survivor and learns that Emperor Vecta's objective is to find the "Priestess of Light."

Sword and Fist still

Episode 9

Sword and Fist

8.9
Dec 8, 201923 min11 votes

Upon seeing Alice, Gabriel orders his entire army to capture her. The pugilists guild races ahead of the main force. As Alice and Bercouli try to come up with a strategy to counter them, the silent Integrity Knight Sheyta Synthesis Twelve steps forward.

Stacia, the Goddess of Creation still

Episode 10

Stacia, the Goddess of Creation

8.9
Dec 15, 201923 min11 votes

Asuna has logged into the Underworld using the superuser account of Stacia, the Goddess of Creation. After she descends, she is reunited with Kirito, thanks to Ronie and Tiese. But soon Alice arrives, leading to a precarious situation!

Heartless Choice still

Episode 11

Heartless Choice

8.6
Dec 22, 201923 min12 votes

Asuna has created a bottomless chasm. The dark knights and the pugilists attempt to cross over to the other side, where the Human Empire Army waits. Meanwhile, Critter releases an announcement about a limited-time beta test for a bizarre new VRMMO.

Ray of Light still

Episode 12

Ray of Light

8.7
Dec 29, 201923 min13 votes

Due to Gabriel's scheme, U.S. players were given black knight accounts, and are now continuously logging in to the Underworld. They begin mercilessly slaughtering soldiers from both the Human Empire Army and the Dark Territory Army.

The War of Underworld still

Episode 13

The War of Underworld

8.5
Jul 12, 202023 min12 votes

Sinon has logged in with the super-account of Solus, the Sun Goddess and rescues Asuna and the others at the last minute. Meanwhile, Leafa logs in with the super-account of Terraria, the Earth Goddess, and descends to the Underworld.

End to Eternity still

Episode 14

End to Eternity

8.6
Jul 19, 202023 min11 votes

Despite its modest size, the Human Empire Army and Asuna valiantly battle the wave of American players surging towards them. But they’re hopelessly outnumbered, and the Human Empire soldiers start to fall one after another.

Instigation still

Episode 15

Instigation

7.3
Jul 26, 202023 min9 votes

Bercouli pursues Vecta, who’s abducted Alice. After a long, vicious battle, Bercouli unleashes his secret sword skill, Uragiri, and finally defeats Vecta, despite having sustained severe injuries himself.

Code 871 still

Episode 16

Code 871

7.9
Aug 2, 202023 min9 votes

The traitor inside Rath turns out to be a researcher named Yanai. When Higa attempts to restore Kirito, Yanai tries to thwart the operation by holding him at gunpoint. Meanwhile, in the Underworld, Sinon confronts Gabriel, who has logged back in.

Prince of Hell still

Episode 17

Prince of Hell

8.1
Aug 9, 202023 min10 votes

Asuna and the others succumb to Vassago and the Chinese/Korean players. Discovering the catatonic Kirito, Vassago kicks his wheelchair over. Enraged, Klein lunges at Vassago, only to be pinned down by enemy players. Just then, someone unexpected appears.

Memories still

Episode 18

Memories

8.7
Aug 16, 202023 min11 votes

Sinon manages to severely damage Gabriel, but her strength has been sapped. Leafa collapses after wiping out the American players. And Asuna, her situation now hopeless, gazes at Kirito. But the Black Swordsman continues to wander through his dreams.

Awakening still

Episode 19

Awakening

9.2
Aug 23, 202023 min12 votes

Escaping his nightmares, Kirito regains consciousness at last. With the Night-Sky Blade in his right hand and the broken Blue Rose Sword in his left, he faces off against Vassago, armed with the Mate-Chopper, now enormous in size.

The Night-Sky Blade still

Episode 20

The Night-Sky Blade

8.8
Aug 30, 202023 min11 votes

Alice and Asuna head to the World’s End Altar as Kirito confronts Gabriel. Unless he can defeat Gabriel and return to the real world before the maximum-acceleration phase begins, Kirito will have to spend the next 200 years in the Underworld.

Beyond Time still

Episode 21

Beyond Time

8.0
Sep 6, 202023 min10 votes

The maximum-acceleration phase has begun. Alice successfully logs out of the Underworld, but Kirito doesn’t make it in time. In the real world, Higa and Kikuoka rush to shut down the STL, in order to disable the maximum-acceleration phase, but…

Alice still

Episode 22

Alice

8.7
Sep 13, 202023 min12 votes

The “Rath Attack Incident,” masterminded by the American National Security Agency, is over. Now head of the newly formed Oceanic Resource Exploration & Research Institution, Rinko unveils Alice to the world as an authentic artificial general intelligence.

New World still

Episode 23

New World

8.8
Sep 20, 202023 min10 votes

Rinko informs Kazuto that Alice is missing. He’s about to rush to the Rath Roppongi branch when the doorbell rings. In a panic, Kazuto throws open the door, only to find a deliveryman there with a huge cardboard box.