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...

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

Sara, Setsuna's beloved sister, is dead, and Tokyo is an instant away from being utterly destroyed--and this chapter of Setsuna's life is just beginning. Meanwhile, the worst angel in the nine spheres is about to make a power grab and take control of heaven!

Despite Setsuna's efforts to deny his love for his sister, he can't allow her to leave the country without letting her know how he feels, but how can she feel about love that borders on incest? She may never live to find out, because an angel has been sent down from heaven just for her-just to make sure that she dies! The two demons from hell, Kurai and Arachne, are still trying to bring out the avenging angel in Setsuna, but first they must deal with the mysterious, seemingly immortal Kira. Even if a way is found to bring the angel Alexiel out of Setsuna, can Tokyo survive the transformation?

High-schooler Setsuna, already burdened with an incestuous love for his sister, finds he has more problems when his past life, as an angel who rebelled against heaven, comes back to haunt him and the people he loves.

The angel Alexiel loved God, but she rebelled against Heaven when she saw how disgracefully the other angels were behaving. She was finally captured, and as punishment sent to Earth to live an endless series of tragic lives. She now inhabits the body of Setsuna Mudo, a troubled teen in love with his sister Sara. Setsuna's misery mirrors the chaos among the angels, and their combined passions threaten to destroy both Heaven and Earth.

Why is Setsuna so mixed up? Despite his attempts to be noble, he'll fight anyone anytime; he ignores all authority; and he harbors feelings for his sister that can only be described as 'incestuous.' Why is he such a mess? The reason may be found with two demons from the underworld and their enemy, an insane angel who is distributing an insidious computer game called Angel Santuary.