A year after DigX opened a stone crypt beneath Hokkaido and unleashed mineral-and-fossil monsters called the Unearthed, disappearances and geological disturbances spread. Amateur investigator Momoka Takahashi receives a snow-leopard medal and a chest-worn transformation device from an anonymous source called Y, becoming a masked hero who battles the Soldiers, Weirds, and Lords while uncovering DigX’s cover-up.