Command a squadron of Stellar Gear, humanoid weapons developed from the technology of ancient alien civilizations, to defend Earth from the invading Relayer aliens.
Mylne, an apothecary, searches the Mysterious Forest for ingredients so that she can brew her potions. But things soon take a dramatic turn from simple errands—eventually, Mylne finds herself caught up in an unsolved mystery, requiring her to take on what lies in the Underground Ruins, deep beneath the forest.