In a world where humans are born with an Affinity, the mark that gives them the power to control one of the four natural elements, Arane Kross grows up deprived of this gift.

Despite the taboos surrounding the use of technology, the young woman takes refuge in the design of machines to try to overcome her handicap until the day she inherits an orb capable of controlling nature: the Ecosphere.

Arane is then recruited by an order to protect the environment, the Green League, to fulfill her civic duty. A year full of dangers, where any difference is perceived as a weakness.

[From official website]