One day, a certain person arrives at the Guild to ask for Goblin Slayer by name. The request comes from the Water District, a neighborhood in the prosperous capital of the Supreme God, and the Arch Bishop that hails form there. The Arch Bishop was once a Gold-ranked adventurer known as the Sword Maiden who defeated the Demon King, a true hero. Now, she comes forward with the details of goblins somehow appearing within the Water district...

Goblin Slayer, alongside his companions High Elf Archer, Priestess, Lizard Priest, and Dwarf Shaman, enter the catacombs beneath the Water District to get down to the bottom of the goblin disturbance!