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.
Setsuna has seven days to find his beloved sister Sara in the afterlife, and the first stop is to find the Guardian of the Hellgate--a being any normal person would avoid! Kato, an old enemy of Setsuna's, is now his only companion, but Kato has a history of being manipulated in life. Now that he's dead at the hands of Setsuna himself, just how far can he be trusted?