At the center of this epic tale of Heaven and Hell and forbidden love is high-school student Setsuna Mudo. He's no angel - he's completely tactless around girls, has an unpredictable temper, and can become extremely violent. That he comes from a broken home and is in love with his sister Sara just makes matters worse. Add teenage hormones and major issues with his mother, and you've got the recipe for one troubled kid. And then Setuna's reality becomes seriously twisted when his past life as an angel comes to plague the present and threatens to destroy the future...