Trapped in Jigoku

Akuma Monsuta's life is anything, but ordinary, her life is extremely different from others maybe it's because she lives with her grandparents because her parents are always out on business, maybe it's because she is a super smart girl, or maybe it's because she is a monster who is attending her first year at Jigoku Academy a school specifically for monster warriors training to defeat humans. Akuma meets several new friends yet something in the school is changing it seems as if it is growing into its own power and strength, Jigoku begins not letting students leave campus and making them train harder. Akuma decides she and her new friends must get down to the bottom of things before they are completely trapped in Jigoku Academy.