Makai Senki Disgaea 01 TV (sub)
Dumb apprentice angel comes to kill evil demon king, wakes up evil demon kid instead, mayhem ensues.

RPG/action game adaption.

Okay, this is for kids, right? The plot is simplistic to the extreme. Humor was okay in the first five minutes when the angel was trying to open the casket, then it became so low level I didn't find it funny any more.