Goblin Slayer Side Story: Year One

Goblin Slayer Side Story: Year One (ゴブリンスレイヤー外伝：イヤーワン, Goburin Sureiyā Gaiden: Iyā Wan) is a prequel series to the Goblin Slayer! light novels. The story is written by Kumo Kagyu and illustrations are done by Shingo Adachi. A manga adaptation by Kento Sakaeda began serialization on September 15, 2017 in Young Gangan.

Plot

 * After his sister is brutally murdered during a goblin raid, a young boy swears vengeance upon the creatures who killed her and the rest of his village. Five years later and now a novice adventurer, he is by chance reunited with his childhood friend, another survivor of the massacre.


 * ''Despite his inexperience, crude battle gear, and low rank, the boy sets off alone on a mission to defeat a lair of goblins--thus begins the origin story of how he came to be known as Goblin Slayer!
 * -Yen Press