A young Priestess joins a group of rookie adventurers who decide to raid a cave infested with goblins. Things quickly go awry when the inexperienced party is ambushed by goblins, resulting in all of them save for the Priestess being killed, raped or captured. The Priestess is rescued by the arrival of Goblin Slayer, who swiftly kills the goblins attacking her. She decides to follow Goblin Slayer as he proceeds deeper into the cave, killing more goblins and teaching her about their psychology and battle tactics. With the Priestess' help, Goblin Slayer is able to kill the remaining goblins, including a goblin shaman and hobgoblin. They then discover several goblin infants, which Goblin Slayer mercilessly kills to prevent them from becoming threats in the future. Despite the traumatic experience, the Priestess decides to join Goblin Slayer as his adventuring companion.

The High Elf Archer, Dwarf Shaman, and Lizardman Priest come to see Goblin Slayer. They tell him of a demon lord that's revived with the intent to destroy the world, and they ask for Goblin Slayer's help. However, he tells them he has no interest until they mention goblins...

The battle against the Goblin Lord and his horde of goblins had begun, and High Elf Archer, Dwarf Shaman, Lizardman Priest, and the other members from the guild face them head-on. Meanwhile, Goblin Slayer goes to face the Goblin Lord alone...