Sword Art Online Progressive Transient Barcarolle is a continuation of the manga adaptation of Sword Art Online Progressive, a spin-off of the original light novels that tell the untold stories taking place in the first two years of the characters’ time trapped in the game world.
The folks at Yen Press are digging a bit further into this franchise as they’ve picked up another release that will make its debut in October 2020 with Sword Art Online Progressive Transient Barcarolle.
The manga is an adaptation of the story from the novel by Reki Kawahara that has Shiomi Miyoshi adapting it and illustrating it.