Goblin Slayer Gaiden 2: Tsubanari no Daikatana is a spin-off series of the main Goblin Slayer! light novel. This is the manga adaptation of the light novel.
Set 10 years prior to the original series, the story centers around Sword Maiden's party of six adventurers on their journey to the Dungeon of the Dead to kill the Demon Lord.

Long ago, a powerful demon lord ruled over the people until an equally powerful hero rose up to defeat him. To counter future threats, Rosewood Academy, a school for heroes-in-training, was created. Today, Rosewood Academy enrolls only the best of the best, and Arnest Flaming is the best of them all. The top student in the school, a dutiful girl nicknamed "Empress of Flame," she has an irritating encounter with a light-hearted boy in the school hallway one day who seems to equal her powers, though she's never seen him before. He introduces himself only as Blade, and Arnest soon finds out not only is he transferring into the school as a new student, but she is personally requested by the King to help him settle in to daily life in Rosewood Academy.