About

Year 20XX Humanity discovered a mysterious island through a rift in space-time. On the eastern side of the island, the sun's movement is fixed, resulting in a perpetual midnight sun. Humans and beastfolk inhabit the eastern side. Settlements range from small villages to large city-level civilizations. The eastern side features vast sandy beaches where the lifeform F5-5 resides. F5-5 is generally non-aggressive. They are composed solely of wooden frames and white cloth; they emit a creaking wood sound when they move. F5-5 does not consume food; it likely survives through something akin to photosynthesis. Their sizes vary wildly—20–30m, 5–10m, or even 1m—but the largest recorded so far is 38m. In the western forests, Red Worms are the primary inhabitants. Red Worms are creatures that fire thread-like mucus to immobilize and prey on targets. However, Red Worms are fundamentally slow and often have their prey stolen by other creatures. Red Worm prey is usually snatched away by the tentacles in the trees. (Red Worms get quite angry about this.) However, Red Worms cannot climb trees. The tentacles in the trees primarily feed on the memories of living beings. The stronger the feeling of pleasure in a memory, the more the tentacles prefer it. Consequently, the tentacles play with their prey before consuming only their memories. After releasing their prey, the tentacles secrete a tiny amount of dopamine to entice them to return, creating an infinite loop. Curiously, while the sun is fixed in the east, the western side experiences a normal cycle of morning, noon, and night. At the boundary, one can see a strange and beautiful landscape, much like a tourist attraction; monsters do not approach this area. Materials obtainable in this world: Found on the eastern coast. White Membrane Stone: Extremely hard, pure white, highly valuable, and easy to process. It is said that if forged into a sword, the blade's sharpness never dulls. Obsidian Soot: Found on the eastern side. Not very hard and easily deformed; if made into a knife, it bends immediately, though it does not break. Its sharpness is incredibly keen but difficult to handle. It is often used for specialized equipment. Wind Iron Ore: Found in the western forests. When soaked in Red Worm mucus, it emits a gas. The gas smells like rusted iron; if water is poured over it all at once, Wind Iron is completed. It deflects kinetic energy, making the user difficult to knock back even when hit. It is hard and easy to process, selling for a very high price. Red Ore: Found at the boundary between the east and west. Emits a laser when stimulated. Primarily used as ammunition for laser guns. It has decent durability, but after 500 shots, the Red Ore loses its function. Its power can easily penetrate 800mm of armor. The body of the laser gun is made of Wind Iron.