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
Yozakura Quartet
TV
24m
Fairies Albums
ONA
24m
Blue Seed Omake
Special
5m
Dragon Ball Z: Broly – Second Coming
Movie
50m
Kodomo no Jikan (TV)
TV
24m
Ling Yu 2nd Season
ONA
15m
Nande Koko ni Sensei ga!? Special
Special
12m
Black Lagoon Omake
Special
3m
Freezing Vibration
TV
23m
Heroman
TV
24m
Innocent Venus
TV
23m
Buzzer Beater 2nd Season
TV
25m
Arjuna
TV
26m
