Bleach Ost - Treachery
9 months ago
Souls who had strong desires, incomplete goals in life before they died, cannot return to soul society where they should be, instead they wander in human world and finally become a hollow, a monstrous form of being which attacks people around them. Shinigamis, or soul reapers, are those who send souls back to soul society.
Ichigo's life completely changes when he borrows Rukia's (a shinigami) power to help her out fighting a hollow but then cannot get rid of it and obliged to stay as a shinigami.