2166, in a cyberpunk world where the mega-corporation Saikou Solutions is ultra-powerful, managing all resource distribution and ruling with their private police force called RAIDEN (雷電), the people are looking for a means to break free.

Climate change expedited by the extractive methods of Saikou have made the planet hostile to humans, forcing many to get cybernetic upgrades not only as a sign of status, but as a means to survive. Many spend their time in the metaverse, an artificial world created by Saikou to control them. With their tailored avatars, humans can experience sensations not possible in the now near-inhospitable real world.

Yakushima Forest is a majestic & enchanted green zone off the Japanese coast where nature has taken back what humans deprived of it. Some humans fled their home cities in search for the mythologized forest, rejecting the version of humanity they had been dealt. When the forest of legend was finally found by some brave adventurers, they came into contact with the seisui, a mysterious luminous mineral present in the sap of the trees found within that altered them, connecting them with Japanese spirits called Yakus that strengthen them. They've developed organic technologies (Yaku Engineering) to advance civilization without harming the ecology that made this new beginning possible. Man, machine and nature came together to infiltrate the Sakouverse, free those lost in the abyss of their current reality, and create their own decentralized metaverse in which all inhabitants can build and contribute freely: the Yakuverse.

Yaku is the growing entity created by the Yakus, led by the hero Isoka Sugiyama. Together, they will spell the end for Saikou Solutions and the beginning of a new real and virtual world.

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