In a world where powerful beings are ranked by abilities, Key Academy is a battleground for the elite. Jelack, a mysterious new student, comes in as a bottom-tier Level D student. As students regularly spar to flaunt their powers, keeping her low rank a secret becomes increasingly difficult. Jelack trains in the shadows, aiming to rise above her D status. With unknown reasons for her transfer and her past shrouded in secrecy, she must uncover her true potential to survive the fierce hierarchy of the academy. Every day is a fight for recognition and respect, and Jelack is determined to prove her worth.