Amane is your average school girl that you can see anywhere, goes to school, hangs out with friends, and enjoying life to the fullest.
Until one fateful day, as she was returning a book back to the shelf, a mysterious book was left on the ground. When she reached for the book,
she was hit with a sudden mysterious feeling that washed over her body. Feeling clueless to what it was, she brought it back with her as she leaves with her friend.
As the sun goes down and they leave for their separate paths, Amane met a mysterious monster and ran for cover, but was surrounded and was trapped by them from all directions.
As she was on the verge of being violated, the mysterious book reached out to her and granted her power to fight back, and thus sparks the start of her journey to save the town.
Will she stay true to her own justice til the very end, or will she fall into their corrupted gasp?