Angel's Magic

Akira, Yukira, and Amethyst are a group of normal teenagers when one day everything changed, since the three orbs in the prophecy disappeared monsters and demons of myths starts to appear wherever they are in school, in malls even in camps.
Now their school's principal Mrs Maryann starts making magic to kill the evil creatures away she starts to train them.
As the prophecy foretold, three angels will have to fight for Mythia the place were magic comes from.

Will Akira, Yukira, and Amethyst be successful in killing the source of evil, Grimoire? What kind of magic does Mythia needs?