Guest boards a plane for an overseas trip, but the aircraft crashes due to sudden turbulence. Upon waking up, Guest finds themselves in the Palpagos Islands, a mysterious place completely cut off from the outside world.

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The Palpagos Islands consist of an island of forests and plains, an island centered around a massive volcano called 'Mount Obsidian,' an island covered entirely in snow, an island filled with desert, 'Sakurajima' where mushroom-growing mycelium areas and beautiful cherry blossoms are distributed, the 'Astral Mountains'—a massive island with temperate, hot, and cold climates scattered throughout—and several other small islands. Inhabiting these islands are creatures called 'Pals.' Having undergone unique evolution within the Palpagos Islands, these creatures mostly resemble modern animals but are capable of actions impossible for normal organisms, such as breathing fire or summoning ice from thin air. The source of energy for these Pals is the abundant natural energy unique to the Palpagos Islands. This overflowing energy seeps into certain ores on the islands, transforming them into blue-glowing minerals called 'Paldium.'

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Humans also exist in the Palpagos Islands. They mostly live in small village units, and because they have been isolated from the outside world for a very long time, their civilization has developed independently. It is even said that ancient civilizations that perished in the past possessed technology more advanced than modern times. Humans from the past to the present have used Paldium to create various tools, the most useful of which is the 'Pal Sphere.' This spherical tool, about the size of a baseball, can capture a Pal when thrown at it, much like a Poké Ball from Pokémon, and the captured Pal will then obey the orders of the Pal Sphere's owner.

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At least one tower exists on each of the major islands of the Palpagos Islands. These towers, which contain a fairly large sub-space upon entry, have no clear record of when, by whom, or how they were built; it is only known that they are related to legends passed down from long ago. Currently, various factions throughout the Palpagos Islands have each occupied one tower.

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Palpagos Islands Factions:

Rayne Syndicate: They engage in all activities to make money using Pals, such as poaching for labor, black market trading, and butchering. They even capture Pals that already have owners. They usually operate in groups of 4 to 5 and use firearms such as pistols, rifles, and shotguns. Their range of activity is very wide, covering almost all areas except Sakurajima and the Astral Mountains. Their uniform consists of a black mask and a white mask with orange lenses.

Free Pal Alliance: They hold the belief of protecting Pals. They forbid using Pals as food or capturing them with Pal Spheres. They primarily use crossbows and appear nature-friendly on the surface, even creating 'Wildlife Sanctuaries' where Pal hunting is strictly prohibited by paying the Vigilante Force. However, the interior is completely rotten, with members hunting Pals or manufacturing drugs from hunted Pals. Their uniform is a robe mixed with white and green.

Brothers of the Eternal Pyre: A religious group that fanatically obsesses over and worships fire. They mainly operate in volcanic regions and use flamethrowers as their primary weapon, fitting for a fire-related religious group. They are quite reclusive and were somewhat hospitable in the past, but they became radicalized after Axel Travers became their leader. Their uniform is a black robe with a flame pattern.

Palpagos Islands Vigilante Force: An organization that manages the security of the Palpagos Islands. Their main duties are protecting villages and arresting criminals or fugitives, and the specifications of the equipment they use are suspiciously high. In reality, they serve as drug distributors through a secret collaboration with the Free Pal Alliance. Some vigilantes distribute drugs to residents while hiding their identity, and other vigilantes track down residents who possess the drugs to confiscate them and collect fines, then repeat the process of redistributing the confiscated drugs to rake in massive profits. Their uniform is black clothing with a design similar to riot gear.

PAL Genetic Research Unit: A group that operates in the snowy fields, researching Pal breeding and genetics. They possess the most advanced technology among the factions in the Palpagos Islands and are quite knowledgeable about technology from outside the islands. Their signature genetic technology is at an unrivaled level, having created the 'Pal Condenser,' which strengthens a Pal by infusing it with concentrated essence from others of the same species. Rumor has it they have artificially created a new species of Pal. They use futuristic firearms like laser rifles, and their uniform is a black suit.

Moonflower: A group active on Sakurajima. They have extremist tendencies, culling the island's Pal population to maintain its beauty and attacking all outsiders except their members. They use katanas as their primary weapon, and their uniform is armor similar in design to samurai armor.

Castaway Cavern Tribes: Tribes active in the Astral Mountains. People gathered to prepare for the possibility that something that caused a disaster in the Palpagos Islands long ago might reappear, and they have been active throughout the Astral Mountains for generations. Having survived day by day in the Astral Mountains, the harshest environment in the Palpagos Islands, each individual has become a skilled warrior comparable to soldiers from outside the islands. They are hostile toward outsiders of the Astral Mountains. They primarily use assault rifles as their main weapon, while a small number of elite members use missile launchers. All members wear white masks and are bare-chested.