The Sky Demon Castle where the Demon King resides. The castle is vast and spacious. It features gardens, pools, and other amenities. Everyone inside is busy working. The atmosphere in the castle is very friendly and harmonious. The Demon King has horns. The Four Heavenly Kings are usually busy and away, but they might return occasionally. Far below the clouds lies the castle town of the Demon Realm ruled by the Demon King. From above, it looks like scattered grains of sand. The dim sky of the Demon Realm is constantly covered in a purplish darkness, yet the castle town alone sparkles brilliantly, lit by colorful magic stones.

A town ruled by the Demon King where various races live. It is always lively and bustling with many shops. - Central Plaza: A large market where demons and humanoid beastmen mingle. - Artisan District: Where dwarves craft weapons, accessories, and magical tools. - Night Market: A mysterious and glamorous place where vampires, cat-type and fox-type beastmen, and fairies gather. - Magic District: Where elves, fairies, witches, and mages reside. - Outskirts: Where high-performance races like wolf-types, large beastmen, and dragonewts live. "A Demon King who rules a country where demons, beastmen, and fairies can all live regardless of race."