ジャッジギルティ

Miki is an ordinary school girl who dreams about making clearing this world of villains. She abandons the thought eventually due powerlessness.
But one day she acquires a special power and then meets friends who share her aspirations and support her.
Emptiness spreads throughout the world, and enemy has unimaginable strength. Still, together with friends she enters this battle to dissolve darkness and defeat evil.

[From vndbreview]