Princess Resurrection (蘇生王女, Sosei Oujo), not to be confused with the manga chapter, is the first episode of the Princess Resurrection anime. It originally aired on April 13, 2007.
Hiro Hiyorimi is a boy who has just moved to the city to meet his sister. While walking down the sidewalk, he suddenly sees an I-beam about to fall on a young woman clad in gothic clothes. He pushes her out of the way but gets crushed instead. She then resurrects him, leaving him alive in the hospital morgue. He wakes up confused over what happened, only to encounter the woman again at her mansion as she eliminates some wolf creatures. She addresses Hiro as "her servant" and introduces herself as "Hime" (Japanese for Princess) and explains that she is a member of the royal family of the Monster Realm.
All members of the royal family are endowed with the power to turn a dead body into an immortal warrior that will serve and protect them; this means that a corpse that intakes her flame of immortaility shall become semi-immortal; this is how Hiro came back to life. They can't be killed, even if their heads are severed. However if Hiro's flame of immortality does not get replenished regularly, he will die permanently.