When the academy is attacked by demons, Seika discovers that Amyu is the Hero. Eager to capitalize on her future power, Seika tries to befriend Amyu, only to be promptly rejected. Soon, an opportunity to forge a connection presents itself when both are "chosen" to perform a ceremony for the academy. Seika and Amyu enter the academy's forest together only to discover a suspicious magic circle that teleports them into a dungeon in the blink of an eye. Will they make it out alive? And is this incident connected to the demon attack? The fates of the Hero and the exorcist begin to intertwine!