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The story revolves around Rin Okumura, a teenager possessing abnormal strength and endurance who, along with his younger twin brother Yukio, was raised by Father Shiro Fujimoto. Soon after Yukio departs to study at the prestigious True Cross Academy, Rin learns that he is the son of Satan, the strongest of all demons. Witnessing Shiro dying to protect him, Rin ends up doing what his guardian asked him never to do: draw the demon-slaying blade Kurikara, which restrains his demonic powers, from its scabbard. From that moment on, Rin not only gains permanent demonic features like fangs, pointed ears, fiery "horns" and a tail, but also the power to ignite himself into blue flames that can destroy almost anything they touch.

Third-year high school student Koyomi Araragi barely survives a vampire attack, thanks to the help of Meme Oshino, a strange man who lives in an abandoned building. Despite being able to save his humanity, several powers from vampirism remained in his body as side effects. With the help of their class representative and close friend Tsubasa Hanekawa, Araragi tries to live a normal life with his newfound abilities.

The suspense horror/dark fantasy story is set in Tokyo, which is haunted by mysterious "ghouls" who are devouring humans. People are gripped by the fear of these ghouls whose identities are masked in mystery. An ordinary college student named Kaneki encounters Rize, a girl who is an avid reader like him, at the café he frequents. Little does he realize that his fate will change overnight when he follows her along and eventually gets turned into a ghoul himself.

YuYu Hakusho follows Yusuke Urameshi, a street-brawling delinquent who, in an uncharacteristic act of altruism, is hit by a car and killed in an attempt to save a young boy by pushing him out of the way. His ghost is greeted by Botan, a woman who introduces herself as the pilot of the River Styx, who ferries souls to the Underworld where they may be judged for the afterlife. Botan informs Yusuke that his act had caught even the Underworld by surprise and that there was not yet a place made for him in either heaven or hell. Thus Koenma, son of the Underworld's ruler King Enma, offers Yusuke a chance to return to his body through a series of tests. Yusuke succeeds with the help of his friend Keiko. After returning to life, Koenma grants Yusuke the title of Underworld Detective, charging him with investigating supernatural activity within the human world.

He is the only one in this world who knows the truth. The secret that the N.H.K. is hiding. A truth that would shatter existence. So he believes anyways.