Goblin Slayer and the others return successful from their quest in the ruins. Goblin Slayer spends a few days sleeping at Cow Girl's home to recover and then heads to the guild. There, he gives advice to a couple of adventurers on how to deal with some giant rats and also accepts a request from Guild Girl.

Goblin Slayer and his party go into the sewers of Water Town to investigate some brutal incidents they think were caused by goblins. When they go down to the sewers, they are immediately attacked by a horde of goblins. Because of the sheer number of goblins, the party has a hard time dealing with them all and then a goblin champion also appears before them.