Goblin Slayer Side Story: Year One manga volume 12 features story by Kumo Kagyu and art by Kento Sakaeda.

“I have a feeling the road that lies before you will be filled with chaos.”  With that, an elven swordswoman offers to join Goblin Slayer in his adventures.  And soon the pair are on the hunt with goblins or worse to slay. But cracks of thunder and sheets of rain herald worse - for those deep footprints in the mud were made by no goblin, but by a nightmarish beast with a lion's head, a turtle's shell, six bear legs, and burning breath - a tarasque!