After settling his debts with the reward from vanquishing a general of the Devil King, Kazuma enjoys a carefree life post-Arcanretia journey. His peace is soon interrupted by a new admirer, Ran, a fledgling adventurer impressed by Kazuma's victories. Eager to impress, Kazuma embarks on a quest to defeat a golem at Luna's request, accompanied by Aqua, Megumin, and Darkness to the ancient ruins.