Since ancient times long past, this world has been ruled by two tarot cards: 
Diablos Tarot—The tarot of the devil that feasts on the souls of living humans and uses that nourishment to bring countless pain and suffering. 
Elemental Tarot—The tarot that draws its energy from the power of nature in order to oppose the Diablos Tarot. 
Girls chosen from 22 different bloodlines become the wielders of the Elemental Tarot, plunging themselves into this secret battle. To maintain the balance of this world, while carrying unbearable guilt… 
Are they executioners? Or saviors? This is the story of the long, long battle fought by girls who cannot escape the fate they bear.
 
(Source: Anime News Network)

Episode 14, included with the 4th BD/DVD volume.

The world is plagued by the "Daemonia". These creatures will take advantage of people experiencing a high level of negative emotions and transform them into bloodthirsty monsters. Only the power of the Elemental Tarot, wield by girls from 22 special bloodlines, can defeat them. Akari Taiyo is a 12-year girl who dreams of becoming a fortune teller just like her late mother. She is chosen to carry "The Sun" card and joins a mysterious Daemonia fighting organization called "Sefiro Fiore". Shortly after joining, Akari learns the horrid truth on how defeating a Daemonia means completely eliminating the person possessed by the creature.

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