Fairy Cube Series by Kaori Yuki

Rebirth Ian and Rin used to just see spirits. Now Ian is one. Using the Fairy Cube, Ian must figure out how to stop the lizard-spirit Tokage from taking over his life and destroying any chance he has of resurrection. Ian is transported to another world by the fairy Ainsel, who promises to help him stop Tokage upon their return to the human plane. By possessing the body of the recently deceased Elijah, Ian attempts to save Rin from Tokage's clutches.

Ian used to just see dead people. Now he is one. Trapped inside his own body by the Fairy Cube, Ian must now figure out how to stop the devious spirit Tokage from taking over his life, stealing his girl and ruining any chance he ever has of resurrection. Tokage has troubles of his own when he gets involved with the Gotoh Group, conspiratorial fairies aiming at world domination. But that doesn't stop him from further terrorizing Ian's family and friends. Is Ian's father also in Tokage's clutches?

Final Volume! Will Ian save Rin? Can he stop Tokage? Ian has one chance left to get his life back!