On the night of the Harvest Festival, an army of goblins creeps toward aborder town from the west, but Goblin Slayer's party has a merciless plan tostop them. However, the enemies' leader finally summons the ancient monsterknown as "Hecatoncheir" in an attempt to crush all in his path. Is this a spellthat can best even the Goblin Slayer...?!