Goblin Slayer Side Story: Year One, Vol. 5 (manga) — Kumo Kagyu

Goblin Slayer and Arc Mage continue their goblin research with a dissection, which provides both useful information and tantalizing theories. Meanwhile, Rookie Warrior heads into an abandoned mine with a gaggle of inexperienced but fearless adventurers -- can he protect this newly formed party from ending up like his last one when they come under attack from an unexpected and deadly threat?! And the women in Goblin Slayer's life show some concern about all the time he's spending with Arc Mage...