Bleach.

Ichigo Kurosaki has always seen ghosts, but the day he meets Rukia Kuchiki changes everything. When the Soul Reaper lends him some of her power to fight a Hollow -- a soul-eating spirit that's drawn to psychic people -- he takes it all, weakening her and making himself a Soul Reaper in the process. Now, it's his job to protect the innocent from Hollows and help the spirits find peace.