Goblin slayer side story: year one, vol. 1 (light novel) (Little, Brown Book Group)

Three days after his sister was no more, he finally gained the will to move. In the aftermath of a goblin raid, a lone boy mourned his village, his family. Five years later, he visited a city on the frontier and became an adventurer. It was five years earlier that the boy who had lost a place to call home was reunited with his childhood friend. Despite being the lowest Porcelain rank, the boy readies himself and then sets off alone for a lair of goblins, marking the beginning of the legend of Goblin Slayer!