When Demon Queen Echidna begins her invasion of the human realm, the people turn to the hero Leo Demonheart to protect them. Blessed with insurmountable power, Leo easily repels Echidna's army, thereby saving the world. But instead of gratitude or admiration, Leo is met with disdain and scorn from his fellow humans, who fear his overwhelming strength and believe that it may eventually cause humanity's demise.
Banished from the kingdom he once called home, Leo wanders aimlessly throughout the land until, one day, he hears rumors of Echidna's efforts to rebuild her army. Hoping that demonkind might accept him as an ally, he returns to the demon queen's castle and offers Echidna his help.
Naturally, Echidna immediately rejects him. Still, not all hope is lost, as Leo manages to convince Echidna's four generals to let him secretly work under their supervision. Donning the identity of a masked dark knight named Onyx, Leo solves the demon army's problems one by one—gradually improving the quality of life around the castle. Above all else, however, Leo wants to accomplish one goal: to learn why Echidna started the war in the first place.+ More
Recommended for you
Is the Order a Rabbit?
TV
23m
Haiyore! Nyaruko-san F
OVA
27m
Hakumei and Mikochi: Screws
Special
24m
Martian Successor Nadesico
TV
23m
Kiniro Mosaic: Pretty Days
Movie
50m
Killer Seven
ONA
11m
Minami-ke Betsubara
OVA
25m
Magic Knight Rayearth II
TV
24m
Major 2nd (TV)
TV
24m
Ajin: Demi-Human
TV
24m
Waiting in the Summer
TV
23m
Nanbaka: Season 2
ONA
23m
Saint☆Young Men
OVA
20m
City Hunter: The Motion Picture
Special
90m
Imawa no Kuni no Alice (OVA)
OVA
23m
