Goblin Slayer Side Story: Year One, Vol. 9 (manga)

Goblin Slayer and his examiner infiltrate the goblin lord's lair and attempt to save a girl being held hostage there-but Goblin Slayer takes a nasty hit to the head in the process...!! Will the two of them be able to make it out, or will his promotion exam end in something far worse than failure?! Meanwhile, having stumbled into a legendary sunken city, Young Warrior's party comes across a grotesque ritual intended to resurrect the demon lord...!!