Aimi, the cheer squad captain at private Katsuragi Academy, is not an ordinary high school girl. In truth, granted power by the god Zeus, she fights as Chia Sapphire—one of the Beautiful Schoolgirl Warriors Chia Knights—battling against demonic forces. Her existence poses a major threat to the demons, who see her as an obstacle to their domination and constantly target her. Enter Kirito, a man who allies with the demons and, through extensive research, succeeds in developing technology that exploits human desires to transform people into monsters. As a result, individuals driven by violent impulses begin appearing, attacking Chia Sapphire. Unlike regular demons, these monstrous humans are immune to divine powers. Forced to fight defenseless and exposed, Chia Sapphire struggles desperately against them. Her battle unfolds as a shocking and emotionally charged series of events.