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故事因一起交通事故而起，日和见日郎因被避闪儿童的汽车撞上死于非命。而汽车要避让的那位“儿童”则恰巧是怪物之国王女的小女仆。死得有点冤的日和见日郎在停尸间正准备长眠于世时，怪物王女却让其饮下自己的血再复生，从此日和见日郎变为王女的血之战士。怪物王女是统治着怪物一族的王族成员之一。但与所有王室一样，为了兄弟姐妹之间经常为争夺王位，进行着杀戮、派系斗争。被卷入王室斗争的日和见日郎将如何面对自己突然改变的命运？
Hime, the immortal princess, revives Hiro, a young man killed in a mysterious accident, binding him to her service in a world of supernatural threats.
Hiro struggles to adapt to his new role as Hime's servant, while they face their first supernatural enemy targeting the princess.
On his first day of school, Hiro encounters supernatural occurrences and learns more about his half-immortal state. An invisible man infiltrates the mansion, posing new threats.
A twisted dollmaker creates lifelike puppets from human victims, forcing Hime and Hiro to confront their humanity.
A vampire noble hosts a deadly banquet, testing Hime's immortality and Hiro's loyalty.
A lycanthrope terrorizes a village, forcing Hime to confront her own monstrous nature.
A witch curses Hiro, forcing Hime to choose between saving him or preserving her power.
Hime's past resurfaces as a rival claimant to her throne challenges her immortality.
Hime and Hiro explore a castle that appears only at midnight, filled with trapped souls.
A village under a silencing curse forces Hime and Hiro to communicate without words.
Hiro finds Hiroko, a cat, by the road and takes her in. Hiroko, actually a cat-person, grows attached to Hiro. She turns out to be an unskilled assassin controlled by the bell on her collar. Shocked by her own behavior, she disappears.
Pharaoh, given the promise of eternal life upon Hime's death, sends his army of mummies to attack Hime. Hime having taken drowsy cold medicine (before knowing about the pending attack) entrusts her life with Hiro.
During a lunar eclipse, Hime and Hiro were pulled into the memory of Akasabi village and had to deal with a serial killer.
Riza has been racing with a ghost knight on Sasanagi Pass. One night, he lost his head and went berserk. Hiro, while helping to search for the knight's head, got kidnapped and turned into Zeppeli's "knight". Hime has to save him.
Hiro's acquaintances find out that he's staying with 3 beautiful women. They confront him and ask Hime if they could be her servants. Hime agrees on condition that they go through an obstacle course in the house. A shape-shifter taking Hiro's form also joins the race to reach Hime first.
Riza, frustrated with training, heads to Hime's lake resort and meets Aron, a were-shark, who was good friends with Lobo Wildman (Riza's brother). Aron turns out to be an assassin of one of the Royalty sent to kill Hime. After being defeated by Riza, she asks Riza to avenge Lobo for her as well.
A witch from the black forest goes after Hime's and Sherwood's spirit to get eternal youth.
A raccoon dog became a vampire hunter in order to feed his family, but mistakenly attacks Hime believing her to be a vampire.
Hime, Hiro and Riza are trapped in a haunted ship and must find and rescue a mysterious mermaid in order to escape. Hime's older brother Emil is introduced.
Hiro is kidnapped by a vampire named Duke Dracul. Riza and Reiri must enter the village of vampires to save him.
