Sword Art Online: Alicization’ın ikinci kısmını konu olan devam sezonudur. Yani 3. sezonun ikinci yarısıdır.
Uyarlama: Sword Art Online (Novel)
Diğer İsimleri: Sword Art Online Alicization War of Underworld, Sword Art Online: Alicization 2nd Season, Sword Art Online III 2nd Season, SAO Alicization 2nd Season, Sword Art Online 3 2nd Season, SAO 3 2nd Season, SAO III 2nd Season, ソードアート・オンライン アリシゼーション War of Underworld
Önceki Hikâye: Sword Art Online: Alicization
Sonraki Hikâye: Sword Art Online: Alicization – War of Underworld 2nd Season