Is It Wrong to Try to Pick Up Girls in a Dungeon? II, Vol. 5 (manga) — Fujino Omori

Having won the battle against Ishtar Familia, Bell takes back Haruhime. Peace settles over the Hestia Familia, but it won't last for long! The Kingdom of Rakia plans to invade the labyrinth city, Orario, and a conflcit breaks out with the militaristic nation led by Ares, the god of war. All of the largest familias find themselves caught in the crossfire, and Bell and the others have to face the aftermath...