SPECTRAL FORCE

In a time when demons rule the world and mankind seeks freedom, human rebels gain control of the demon-slaying sword Tenmaken and attempt to assassinate the Demon King Janus. To preserve the sovereignty of her homeland, the half-human, half-demon Princess Hiro must overcome her deep hatred of the humans or face a war that will ravage the entire world! (Source: AniDB) — Description from AniList community (anilist.co).