At Kaihen High School, student council president Kitaki Misaki rules with strict discipline. Respected by teachers and admired by many, yet resented by others for her no-nonsense attitude. But when a mysterious earthquake strikes, reality itself begins to warp. Students succumb to primal lust, and chaos erupts. After being attacked by a deranged aide, Kisaki hears a divine voice and awakens as a "Demon Sealer", summoning her "Demon Sealing Armor" to fight back.

Now, armed with sacred power and unyielding will, Kisaki must battle through a school where normalcy has been rewritten. Corruption lurks in every hallway, and only she stands between order and total depravity.