Legend of the Overfiend

Legend of the Overfiend is an American animated Tv series that is loosely based on the Japanese anime Urotsukidoji.

Plot
Amano, a Guardian from the Heavenworld, comes to our world to locate the Chosen One; one personb who will save our world from the Demonworld by killing the Demon King. However, the Demon King then sends out his minions to hunt down and kill the Chosen One.

Overview
Season 1:

Amano and his sister Mimi arrive in the Humanworld to locate the Chosen World; destined to save the Humanworld from the invading demons of the Demonworld by slaying the unholy King of Demons. Meanwhile, Amano saves Akemi, a young schoolgirl, from an attacking demon familiaar, but she mistakes her saviour as being the school nerd Nagumo and they grow into a romantic relationship. Amano believes that he has located the Chosen one is the school's star basketball player and American exchange student Darren. However, Darren is later turned into a beast-like form during a demon attack, and although he kills the demons, he fails Amano's test, survivng an acid rain storm, and perishes, shocking Amano. Meanwhile, Mimi begins to suspect that she has found the Chosen One in the unlikely form of Nagumo. In the Demonworld, however, the Demon King, Moloch, also suspects Nagumo of being the Chosen One and sends his demons out to kill him. After Mimi fights them off, though, they discover a different route; Koji, another bullied student who also loves Akemi and now despises Nagumo, despite formerly being his friend. The demons kidnap him and grant him unholy powers, with which he is to kill Nagumo. However, Amano and mimi pursue the two to an abandoned construction site, where Koji is holding Akemi captive. In the final battle, Amano fights Koji before Nagumo finally kills him by impaling with a larg pole. Amano tells Nagumo that he will be watching over he and Akemi from now on.

Season 2: