Goblin Slayer side story, year one. Volume 1

"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...