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Environment
The story of Rain World takes place on a terrestrial planet, similar to Earth with a yellow sun and a singular moon that can be seen alongside peculiar green stars in the night sky. As long as it has been recorded, the surface of the planet is icy and cold, likely devoid of most forms of life, apart from the ruins of countless civilizations past, particularly the still active megastructures from one of the more recent extinct civilizations, whose facilities output a significant amount of heat as a product of their functions.

The Great Cycle
All beings in the universe of Rain World are locked in an everlasting cycle of death and rebirth. The specifics of this and how it works are unknown, as no concrete information is given. Creatures can die out, and new species can emerge and evolve, but no soul ever truly leaves this world. This property was discovered by the planet's dominant species, colloquially known as the Ancients, who viewed it as a prison. They desired a way to break free from the cycle, to truly pass on from the world—a process they dubbed "ascension". Means of ascension were eventually found.

Intelligent Life
The aforementioned Ancients were a powerful, Buddhist-influenced dogmatic society heavily enveloped in their traditions and beliefs. Even with their collective power, they were unable to break free of what became known as the Great Cycle, the universal element that affected all living creatures. Other prevalent intelligent species, at least within the time frame of the game events, include the Slugcat head 24x.png Slugcats, a nomadic stout bodied bipedal organism capable of hunting, non-verbal communication, and social interaction. Their abilities are not dissimilar to the Scavenger icon.png Scavengers, a lankier more primate like species that are much more tribal and collective, wary of other creatures but capable of trade and communication with others if the proper precautions are taken.

Most, if not all life seen within the world are descendants of purposed organisms, a mix of organic and inorganic life-forms created and genetically engineered by the Ancients for their own functions, whether it be production or amusement; working at such an unprecedented efficiency with the combined advantages of their biological components structured and streamlined as if it were a machine. Occurring within the Void Fluid Revolution, much of the natural flora and fauna of the world had died off or disappeared by the time the Ancients had obtained this power, resulting in most of the evolved lifeforms seen eons later being offshoots or at least part of these once unnatural creatures. A good example of this are Miros Birds, which were created to protect the Memory Crypts. The Slugcat species is suggested to be a descendent of a purposed organism, a type of slug creature that would clean the insides of pipes. While not stated in game, it is heavily implied that the Spearmaster is a purposed organism, created to be an ideal messenger.

Pearls
Pearls are reflective, spherical objects used by the Ancients to store information, ranging from stories to images to songs. Many are found scattered throughout Rain World, holding a vast array of history and data. Much of the information within this page is sourced from these data pearls, which were often used as facility logs or records of iterator communications, in which Looks to the Moon at different points in the timeline will provide different transcriptions of most pearls, alongside the pearls that can be read within Artificer's campaign by Five Pebbles, providing their own unique perspective on established pearl transcriptions and often providing new information altogether.

It’s about a kid who is greatly depressed, and is seeing rain as a coping mechanism

not even close

It’s literally just about rain