Sword Art Online: Alicization announced the Japanese release date for War of the Underworld.
According to the official website, War of the Underworld will premiere on October 12, 2019 on Tokyo MX, BS 11, Gunma TV, Tochigi TV, MBS, and Anema TV. It will debut on October 13th on At-X and on TV Aichi on October 15th.
最新章『ソードアート・オンライン アリシゼーション War of Underworld』の放送局・放送時間を公開！
— アニメ ソードアート・オンライン 公式 (@sao_anime) September 10, 2019 
Crunchyroll  reports Alciziation adapts the original bunko’s ninth volume to the 18th volume which includes Alicization Beginning and Alicization Lasting. The first part of the anime concluded with the adaptation of the fourteenth volume, Alicization Uniting. The second part of Alicization begins with War of the Underworld.
Here’s a look at War of the Underworld’s latest poster.
Aniplex released a trailer for War of the Underworld back in July. Take a look.
Sword Art Online was originally a light novel series created by Reki Kawahara with illustrations by abec. The story follows Kazuto “Kirito” Kirigaya and Asuna Yuki as they play a number of virtual reality MMORPGs that include Sword Art Online, Alfheim Online, and Gun Gale Online.
Are you looking forward to the second part of Sword Art Online: Alicization War of the Underworld?