Ayeka is a talented, but hot-headed agent for the Deep Garden, a secret organization tasked with exorcising spectral entities known as "Spiders". But when more powerful Spiders start to appear, Ayeka's recklessness will both help and harm her, as she embarks on a journey to discover the secrets of the mysterious Black Compass project. Will she lose herself in her findings? Or will she gain the power to send the Spiders back to Hell?