Set in a world shaped by human imagination, phantoms - beings akin to ghosts or monsters - emerge and are dubbed as 'phantoms'. Haruhiko Ichijō, a freshman at Hosea Academy, joins forces with his senior Mai Kawakami, who wields the 'Spirit of Five Elements' power, Izumi Reina with the ability 'Phantom Eater', and the solitary phantom fighter Koito Minase. Amidst the trials of high school, they navigate through a revelation-triggering event that unravels the mysteries of their fantastical reality.