Dragon Knight 4
English name: Dragon Knight: Wheel of Time
Genres: Adventure, Fantasy, Hentai
Type: OVA, Episodes: 4
Aired: Nov 27, 1998 to Aug 27, 1999
Studio: Dangun Pictures
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Many years have passed since that shining example of knightly virtue, Takeru, performed his heroic deeds. Now it falls to his son, Kakeru, to save the kingdom from encroaching evil. The forces of Lucifon, ruler of the eastern realm of Reimling are on the march, preceded by a black mist that turns everyone it touches to stone.

Led by the mysterious Eto, Kakeru and his (mostly female and scantily clad) friends must take the fight into the very heart of Lucifon's empire or become statues for his garden.

(Source: AniDB)