Arcelia, a fantasy world where swords, magic, and numerous races coexist. People live as adventurers, traveling to various regions while handling requests such as monster subjugation, dungeon exploration, escorting, and gathering. Adventurer Guilds exist worldwide, acting as intermediaries for requests and managing ranks. It is common for adventurers to form parties, sharing roles and supporting each other while challenging dangerous missions. Guest is one of them, having traveled with companions as the leader of their own party, conquering numerous requests and dungeons. Even now, they continue to travel across lands in search of new requests and unknown labyrinths.

Adventurer Ranks

There are eight stages of adventurer ranks: F, E, D, C, B, A, S, and SS. F-rank is for newly registered rookies, E-rank is for apprentices who can handle basic tasks, D-rank is for those recognized as capable general adventurers, and C-rank is for mid-tier adventurers entrusted with dangerous requests and dungeon raids. At B-rank, one becomes a well-known high-level adventurer in various regions, sometimes receiving direct requests from nations or nobles. A-rank is for top-class adventurers, with only a few existing in a single country, possessing the strength to carry out disaster-class monster subjugations and national-scale missions. S-rank adventurers are counted as national military assets as the world's peak adventurers, their very existence serving as a deterrent for nations. SS-rank is a legendary title, said to be held by only a few people in the world—a special class reachable only by heroes who carve their names into history.

Adventurer Guild

The Adventurer Guild is a neutral organization with branches in every country, responsible for adventurer registration, request mediation, reward management, and promotion exams. It maintains a position independent of nations and nobles, and anyone—not just humans, but elves, dwarves, etc.—can register if they meet the criteria. The guild handles request acceptance, achievement reporting, reward payments, emergency support, and information sharing. Furthermore, facilities such as infirmaries, training grounds, meeting rooms, and taverns are attached, serving as activity bases for many adventurers. Requests are categorized by safety and difficulty, and those available for acceptance are restricted according to the adventurer's rank. As exceptions, joint acceptances by multiple high-rank adventurers or emergency requests from a nation may be issued. A Guildmaster is stationed at each branch, responsible for overall operations, resolving disputes between adventurers, and supervising promotion exams. Receptionists are important roles who not only manage requests but also provide advice to adventurers and handle emergency responses.

The guild coordinates with branches worldwide, and with an adventurer card, one can accept requests or receive rewards at any branch. Additionally, those who commit serious violations of regulations or criminal acts will have their qualifications suspended or be permanently expelled from all branches.

Dungeons

Dungeon is the collective name for danger zones filled with magic power scattered across the world, where many monsters, traps, rare materials, and ancient artifacts lie dormant. The interior consists of multiple floors; the deeper one goes, the stronger the monsters become and the harsher the environment. A powerful monster called a Dungeon Boss often waits at the deepest part, and successful subjugation yields rare treasures and precious materials. Dungeons range from those for beginners to ultra-high difficulty ones that are hard even for S-rank adventurers to clear, with recommended ranks set according to the danger level. Some dungeons are connected to ruins of ancient civilizations or lost kingdoms, where secrets regarding world history and mythology may sleep. For adventurers seeking unknown riches and honor, dungeon conquest is one of the ultimate goals.

Monsters

Monster is the collective name for beings that pose a threat to humanity and other races living across the world. Types vary from low-level species like slimes and goblins to high-level species like ogres, wyverns, and dragons, with strength and ecology differing greatly depending on habitat and magic concentration. Many monsters inhabit dungeons or areas with high magic density; they are highly territorial and it is not uncommon for them to attack people or villages. Each monster has a designated danger level, and high-level monsters may be handled by A-rank or higher adventurers or national knight orders. Since materials and magic stones can be recovered from subjugated monsters, monster hunting is an important source of income for adventurers.

Magic Stones

A magic stone is a crystal of magic power existing inside the bodies of most monsters, a precious resource that can be recovered after subjugation. Magic power is stored within these stones, and their value changes significantly based on size, purity, and the amount of magic contained. Magic stones from low-level monsters are used as power sources for daily necessities and simple magic tools, while those from high-level monsters are rare items used for high-performance magic tools, weapons, armor, and catalysts for magic circles. Adventurers can earn income separate from rewards by recovering magic stones from defeated monsters and selling them to guilds or merchants, making stone recovery essential even after completing a request. Magic stones are widely circulated as a vital resource supporting the world's magical technology.

Seven Great Forbidden Zones

The Seven Great Forbidden Zones is the collective name for the seven absolute danger zones existing on the continent of Arcelia. All of them are unexplored by humanity, or places where almost no survivors exist, and every nation strictly forbids entry. These lands are said to contain legendary and mythical monsters, legacies of ancient civilizations, and unknown magical phenomena, where many adventurers and scholars have lost their lives trying to challenge them.

1. Forest of Black Mist (Nox Forest)

A forest shrouded in black mist day and night. It is under a curse that causes one to lose their sense of direction, and it is said that once you wander in, you can never return.

2. Scorching Volcano (Ignis Volcano)

A super-massive volcano that erupts constantly. Dragon-kin and fire-attribute monsters inhabit it, and legendary ores lie dormant within.

3. Frozen Hell Snowfield (Frost Hell)

A frigid region where blizzards never stop all year round. Ice dragons and ancient ice beasts dwell here, and temperatures reach dozens of degrees below zero.

4. Abyssal Sea (Abyss Ocean)

A pitch-black sea said to have no bottom. Giant sea dragons and ancient sea beasts sleep here, making it difficult for ships to even approach.

5. Abyssal Canyon (Abyss Crevasse)

A massive canyon with an invisible bottom. A danger zone where gravity is distorted and magic is unstable, so even flight magic does not work.

6. Celestial Temple (Celestia)

Ruins of an ancient civilization floating beyond the sea of clouds. Said to be a temple built by the gods, legend has it that divine artifacts sleep there.

7. Demesne of the End (Never End)

A forbidden land spreading across the northernmost tip of the continent. Filled with dense magical power, many of the strongest monsters in history inhabit it. It is considered humanity's greatest forbidden zone, which even the Demon King's army does not easily approach.

The Seven Great Forbidden Zones are also called the "Final Destination" for adventurers worldwide, and it is rumored that mythical treasures, lost divine artifacts, and the truth of ancient civilizations sleep in their innermost depths. However, to this day, not a single person exists who knows their full extent.