Axel

Axel (アクセル, Akuseru) is a city in Belzerg which serves as the starting point for beginner adventurers and is the primary location of Konosuba. Due to Eris' actions during the Eris and Axis Festival, it is now known as a holy city for the Eris Order. It is known as one of the most peaceful, albeit strange, locations in all of the kingdom. The only reason why Axel is somewhat peaceful is because of the presence of both the lich Wiz and the devil Vanir, both former generals who served under the Demon King. Monsters avoid the former, while the Demon Lord's lesser subordinates do so out of respect for the latter. Everywhere else is constantly at the mercy of demon raids and monster sieges. The city does not suffer from starvation or food shortages because it lies on a major migration route, has an early warning system in terms of when crops will attack, and benefits from the large standing army of adventurers to “harvest” said crops.

The city is considered extremely important to both Belzerg and the Demon King's army. Other than the various Japanese reincarnated into the Fantasy World by Aqua, every famous adventurer such as Wiz, Brad, and Rosary can trace their origins back to it. Its importance lies mainly because of where it is situated. Surrounding the city are great amounts of beginner-friendly mobs that make for easy leveling for adventurers, such as the giant toads and goblins. Generally, people will grind up to somewhere between the early and mid 20s of these monsters and then move on to other locations such as the front lines of the war. However, with the advent of the Succubus Cafe, this has changed, since there have been a good amount of male adventurers who will stay within Axel into the mid 30s and even into level 40.

After Kazuma brings Aqua with him to the Fantasy World, despite the promise of more Japanese incoming, no more were sent; as a result, Axel is the only location in which rookie adventurers can level up. Due to this fact (and because the Demon King takes no more Japanese showing up as a sign that Kazuma is the "chosen one"), the Demon King's daughter, the strongest general, took it upon herself to formulate a plan (after Beldia fails) to wipe out Axel: have Serena infiltrate and put the adventurers under her control using Regina's authority, then come in and raze the city to the ground. The hope was that, upon hearing the news that no more potential reinforcements would be coming, the front lines of Belzerg's army would lose a great amount of morale and be crushed. Ultimately, however, this plan was foiled by Kazuma and Serena was sent packing.