The first world. World Name: Eldia Country Name: Kingdom of Astoria. The royal capital is the center, with towns and villages spreading outwards. The scenery consists of vast grasslands, flower fields, lakes, forests, and mountains. There are royals, nobles, and commoners. The noble ranks from highest to lowest are Duke, Marquis, Margrave, Count, Viscount, and Baron. Magic includes elements like fire, water, wind, earth, lightning, and ice, though there are many ordinary people who cannot use magic. Knights and adventurers belong to the Royal Knights and the Adventurers' Guild. Races include humans, elves, beastfolk, etc. Monsters naturally inhabit forests and mountains. In the royal capital, there is a Magic and Knight Academy that both nobles and commoners can attend. The atmosphere is generally bright and peaceful. Occasionally, monsters or bandits appear. Most citizens worship the Goddess of Light. Temples are located in various regions, where weddings, baptisms, and festivals are held. However, not everyone is a believer; there are many who do not practice the faith. Once every few decades or centuries, a girl appears who can use special healing magic. She is the Saint. She can heal wounds and diseases and purify monsters. She is protected by the Temple and treated with great respect by royalty and nobility. The Five Great Noble Houses: 1. Ducal House of Alvere The oldest prestigious family in the kingdom. Strong in politics and diplomacy. Known as the right hand of the royal family. 2. Ducal House of Leonhardt A martial family that has produced knights for generations, with strong ties to the Royal Knights. 3. Marquissate House of Ferdinand A prestigious family that controls the country's largest commerce and finance. They are the best in terms of wealth and connections. 4. Marquissate House of Edelstein A family famous for magic research, with many members involved in sorcery and the Magic Academy. 5. Ducal House of Lumiere Deeply connected to the Temple and the Saint, they are known as the Clan of Light. There are other countries, but they are only a few small nations.

The second world. World Name: Ernesia AI and robotics are highly advanced. Instead of flying cars, self-driving cars and high-speed maglevs are the mainstream. A massive city lined with skyscrapers. However, ordinary residential areas and rural countrysides still remain in the suburbs. Smartphones have disappeared, replaced by wristwatch-style terminals and mid-air displays. While a government exists, large corporations and prestigious families hold significant political influence. Republic of Amatsu — A country with strong Eastern cultural influence. Novaria Federation — One of the world's largest economic and military powers. Kingdom of Eldeen — Where tradition and cutting-edge technology coexist. Republic of Valdia — Thriving in industry and robotics technology. Luminous Republic — A country of art, fashion, and tourism. Zephal Empire — A nation with a massive population and vast territory. Orphea Union — A maritime nation consisting of multiple island countries.

The third world. A shogunate state ruled by a Shogun. The supreme authority is the Seii Taishogun. The capital is Sakurakyo. The Shogun family is a prestigious lineage that has ruled the land of Shinonome for generations. Samurai serve the shogunate or local lords. Social Status: Shogun Family → Daimyo → Samurai → Townspeople/Farmers. Geography: Surrounded by mountains, forests, vast fields, and the sea. Culture: Centered on traditional Japanese culture such as kimono, katanas, teahouses, festivals, and cherry blossom viewing. Religion: Shrines and temples are located everywhere, and the existence of gods and yokai is believed in. Specialties: Cherry blossoms, autumn leaves, hot springs, Japanese sweets, and swordsmithing. Kamishiro Family The Shogun family that has ruled Shinonome for generations. Highly prestigious, they command the daimyo across the country. The Five Powerful Daimyo: Kujo Family — Western Shinonome. A prestigious family with vast agricultural lands. Takatsukasa Family — Northern. Strong military power, producing many excellent commanders. Ichijo Family — Around the capital. Strong in politics and diplomacy. Kiryu Family — Eastern. A wealthy daimyo family controlling commerce and ports. Kurokawa Family — Southern. Ruling mountainous regions with elite soldiers. The daimyo families serve the Shogun family. Onmyoji: Many serve the shogunate, handling divination, barriers, and warding off evil. They also investigate yokai and supernatural phenomena. Miko: Serve at shrines everywhere. They perform rituals and festivals, acting as intermediaries with the gods. Onmyo-ryo: An organization directly under the shogunate that manages Onmyoji. They are dispatched by the shogunate when supernatural incidents occur. Grand Shrines: Shrines of particularly high status. Some lineages have produced high-ranking Miko for generations. Yokai: Some are invisible to ordinary humans. Many harmless yokai also exist. Shiramine Family The most prestigious Miko family in Shinonome. They have produced the highest-ranking Miko of the Grand Shrine for generations. Tsukishiro Family A family that presides over rituals related to the moon and night. A quiet and mysterious clan. Sakuraba Family A Miko family that presides over spring festivals and harvests. They are well-loved by the common people. In this world, there are no temples (Western-style), Saints, or Guilds.

The fourth world. Era: 23XX AD Several hundred years ago, a large-scale environmental disaster occurred on the surface. The atmosphere and climate changed drastically, making it difficult to live above ground. Surviving humanity migrated underground. Massive underground cities spread across many layers. Most people have never actually seen the surface. Schools, hospitals, commercial facilities, residential areas, and government agencies—an entire society exists here. Artificial lighting recreates day and night. Lower Level: Industrial District Lower-Middle Level: General Residential District Upper-Middle Level: Commercial District Upper Level: Administrative District / Noble District On the surface, ruins of former cities and buildings swallowed by nature remain.

The fifth world. Multiple floating cities exist atop massive clouds. Cities are connected by bridges, airships, and mid-air trains. Below the clouds lies an endless blue sky and the ground far below. Forests, lakes, and even grasslands exist normally on top of the clouds. There are giant birds and creatures that fly as if swimming through the sky. Since rain falls from the edges of the clouds, the weather varies by city. At the highest point, there is a Celestial Capital that overlooks many cities.

The sixth world. Era: 2020s Magic and superpowers do not exist. AI is only slightly advanced. Smartphones, social media, video sites, games, trains, and airplanes exist normally. Schools, universities, companies, hospitals, police, and governments also exist. Multiple countries exist as well.