Raised in isolation after his parents abandoned him, Raise Ookuni has sworn to a solitary existence. But when he encounters the tough yet aspiring manga artist Kamika Mikami, he finds his resolution challenged. Soon, they're thrust into a strange new world and forced to face a legendary monster. Unbeknownst to them, their after-school club is actually a secret organization fighting malevolent spirits. As they become embroiled in a cosmic power struggle, flashes of memory reveal the key to their survival in this unfamiliar realm. To protect what they hold dear, they must uncover long-hidden secrets.