The story follows Maria, the most powerful witch who lives during the Hundred Years' War in France. She despises war, so she obstructs battles with her strong magical powers. Her meddling with her succubus Artemis and incubus Priapos has caught the attention of the heavens, and so the Archangel Michael issues an edict. When Maria loses her virginity, she will also lose her magical powers. A beautiful angel named Ezekiel is supposed to watch Maria and make sure the witch does not use magic in front of people, but Maria continues to use magic anyways.
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(Source: Anime News Network)

Episode 1 - Perfect Virgin

Episode 2 - Against the World

Episode 3 - By Faith, Not Arms

Episode 4 - Remember to Die

Episode 5 - Courage, Prudence

Episode 6 - Under the Rose

Episode 7 - War Feeds on War

Episode 8 - Man Is a Wolf to Man

Episode 9 - With a Grain of Salt

Episode 10 - I Hate and I Love

Episode 11 - If You Wish to Be Loved, Love

Episode 12 - Love Conquers All

Production I.G

Bandai Visual

Kodansha

Lantis

I Will

Maria the Virgin Witch