With fearsome Youi beasts showing up at construction sites within the Inba Swamp, bathhouse employee Ryuudou Yukiatsu must call upon Ayagami -- "the power to find the words behind things" -- to determine what they're up to. Soon, their plans are revealed as the skies over Japan become the site of a gruesome battle between two monsters vying for control of the nation's fate in this popular anime series.