Hiro Hiyorimi is a boy who has just moved to the city to meet his sister. While walking down the sidewalk, he is suddenly hit by a car (crushed by construction beams in the anime). On the verge of death, he is seen by a young woman clad in gothic clothes. She then resurrects him, leaving him alive in the hospital morgue. He wakes up confused over what happened, only to encounter the woman again as she eliminates some wolf creatures. She addresses Hiro as "her servant" and introduces herself as "Hime" (Japanese for Princess). The story then follows Hiro as he assists Hime in killing creatures that have been sent by her siblings to attack her.
-taken from wikipedia

Picture	Real Name	Description
	Hime/Lillian	The titular character of the series. She is the second princess of the royalty, daughter of the king of all monsters. She resurrects Hiro on a whim after he dies, thinking him interesting enough to be her servant. She is not as arrogant as she is playful, and she does not flinch at the sight of violence. Her aristocratic nature is shown in her ability to leave hard labor to her servants without remorse. She is also not above destroying anything in her path to kill an enemy, and using any weapon at her disposal, such as a chainsaw, a defibrillator, a hammer, or various swords.
	Hiro Hiyorimi	A middle school boy who dies at the beginning of the series . He finds himself in Hime's service as he is bound to her as it was her that insured his resurrection. Though young and not very strong, Hiro manages to assist Hime (mostly by being a human shield) through his "half-immortality" that was given to him after his resurrection.