Haou Taikei Ryuu Knight: Adeu Legend

覇王大系リューナイト アデュー・レジェンド

In an old world clash between light and darkness (as always), the evil Lord Uongadis is sealed away under a gigantic monument called the Earth Blade. 20 years have passed since the wars, and now the threat of evil being brought back is greater than ever as demons try to revive their lord.

(Source: Anime News Network)