A few days back,Sword Art Onlineannounced a unique collaboration withMarvel’s Eternals. Well, the official illustration for this interesting union came out, and here’s everything you need to know about it.

Sword Art Online Progressive: Aria of a Starless Nightis the second anime film in the SAO series. The Japanese sci-fi animation film is based on light novels written by Reki Kawahara. The prequel movie focuses on Kirito and Asuna, and it came out in Japanese theatres on July 22, 2025.

On the other hand,Eternalsis the latest Marvel movie that had a theatrical release on November 5. The 26th film in the Marvel Cinematic Universe features an incredible cast, including Kumail Nanjiani, Brian Kit Harington, Salma Hayek, Angelina Jolie, Richard Madden, etc.

The official Twitter account ofSword Art Onlineannouncedthe collaboration withEternalsthrough a short video. The news came as a surprise for SAO fans who are also obsessed with the MCU movies.

Eternals x Sword Art Online Progressive Aria of a Starless Night Collaboration

While fans are enjoying the release of theSAOandEternalsmovie in theatres, the creators released the official posters for the collaboration. Here you go, take a look at the new illustration yourself:

Similar to Sword Art OnlineProgressive: Aria of a Starless Night,Eternals, in a sense, is an origin story. It shows the backstory of a group of superheroes who arrived on Earth thousands of years before the events of current MCU movies. So, it makes sense why Reki Kawahara decided to collab withEternals. As stated in the⠀⠀⠀⠀大ヒット上映中『劇場版#ソードアート・オンライン-プログレッシブ- 星なき夜のアリア』　　　　 　&　 『#エターナルズ』トレーラーに続きコラボポスター解禁！“結集”したプレイヤーたちがそれぞれの“戦い”に挑む。2つの<始まりの物語>を劇場で目撃せよ！#sao_animepic.twitter.com/5r5ey7QgfQ— アニメ ソードアート・オンライン 公式 (@sao_anime)June 19, 2025" target="_blank" rel=“noreferrer noopener nofollow”> official Tweet, the collaboration is to celebrate two stories of the beginning.

⠀⠀⠀⠀大ヒット上映中『劇場版#ソードアート・オンライン-プログレッシブ- 星なき夜のアリア』　　　　 　&　 『#エターナルズ』トレーラーに続きコラボポスター解禁！“結集”したプレイヤーたちがそれぞれの“戦い”に挑む。2つの<始まりの物語>を劇場で目撃せよ！#sao_animepic.twitter.com/5r5ey7QgfQ