In the 27th century, most of the Earth is covered by sprawling cities, giant industrial complexes and barren wastelands, abandoned by most of the population. Nature is hard to find in those times, tamed, hurt and destroyed by centuries of pollution. In the heart of one of the largest cities in North America, cut off from the neon lights, enclosed in its own atmospheric bubble, survives the last green canyon of the country. Keeping it intact and thriving, however, is a dangerous challenge.