Spectral Force - Season 1 Episode 1 Rebirth of the Demon Forces

Demon Century 997. The main continent of the world of Neverland has been under the rule of Demon Lord Janus for the longest time, using fear to quell any revolts by humans & prevent yet another war that would kill millions like before. Still, the humans want their freedom back, so a small troupe lead by a young warrior named Chiffon manage to get a hold of the Tenmaken, a sword made by the gods, & Chiffon himself uses it to kill Janus after infiltrating the Demon Lord's castle.