Is It a Sin to Say "I Love You"

When a demon, Theiola, of the underground kingdom of "Hell" is cast out of her abusive home and forced into the world of modern humanity, she is forced to come to terms with her feelings, and her conflicting nature with those very same feelings, all the while being hunted down by both the angels of the flying kingdom of "Eden" and the Princess of Hell, Yseraith.

Even stranger, when she encounters a punk who's found himself in hot water with his ex-girlfriend, a wannabe yakuza by the name of Koshien Karee, the two team up to overtake the Princess of Hell, and defeat Koshien's evil ex!