is a Japanese manga written and illustrated by Shin'ichi Kuruma. It was serialized in the Tokuma Shoten magazine Monthly Shà Ânen Captain infrequently between the May 1986 and August 1989 issues. Originally released in four tankà Âbon (bound volumes), Majinden was later re-released in two larger volumes on December 20, 2008.
The manga was adapted into a single-episode anime titled released direct-to-video on December 10, 1987. It was directed by Ichirà  Itano, and features character designs by Nobuteru Yà «ki and a musical score by Shirà  Sagisu. The anime is considerably condensed when compared to its manga source material, making many characters seem out of place. The OVA was localized in English and released in North America by AnimEigo on VHS July 31, 1996 and on DVD September 23, 2003. The anime has been out-of-print in the region since 2011.
Riki Hyà Âdo is a high school karate prodigy who enjoys fighting challenges. At the same time, unbeknownst to him, he is the prophesied vessel of Lord Byà Âdo, demon king of the Dark Realm, who learns his dark energy is empowering Hyà Âdo through a dimensional gate to produce a legendary warrior. Wanting to investigate this, Byà Âdo travels to Earth and supernaturally freezes the school to challenge Hyà Âdo. The boy defeats the demon's spirits, but is easily submitted himself by Byà Âdo, who reveals they are both the same being and, suspecting the prophecy to be a trap, fuses them together in Hyà Âdo's body to absorb his power. Hyà Âdo believes the whole ordeal to be just a dream.
Shortly after, Space-Time Continuum Inspector Zankan arrives to Earth after detecting demonic activity, and he witnesses a young man with spiritual powers, Toshimitsu Yà «ki, fighting and destroying man-possessing monsters. Next day, Yà «ki ambushes Hyà Âdo, feeling the dark energy inside him and wrongly believing him to be the master of the demons, and it takes Byà Âdo's power to stop him. Byà Âdo has deduced the culprit is his own demon lieutenant, Fairy Master Kain, who has secretly betrayed him, and proposes Yà «ki to team up in order to defeat her and her servants. Meanwhile, Kain deceives Megumi Koyama, a girl with an unrequited love for Hyà Âdo, and uses her emotions to create a demon and attack Hyà Âdo's close friend Ryà Âko Takayanagi. Zankan saves Takayanagi and interrogates her about Hyà Âdo, after which the latter uses his power to make her forget the encounter.
Zankan meets Hyà Âdo and allies temporally with him after a friendly spar, while Kain visits Yà «ki in his shrine and possesses him. During a school event, Hyà Âdo saves Megumi from demon-possessed students, but she is also infected by a demon and he is forced spend a lot of energy to destroy and resurrect her. At the same time, Zankan is attacked by Yà «ki-Kain, who defeats him and is about to kill him before Hyà Âdo intervenes. Hyà Âdo and Kain face off, wrecking the school in the process, and although Kain has the upper hand, Byà Âdo manages to take over momentarily and destroy her. After the battle, with Zankan's memory of the events erased, everything returns to normal.