Casshan: Robot Hunter is a oVA anime that premiered in summer 1993, produced by Tatsunoko Production.

About the production: there are 4 episodes of about 27 minutes and its current status is "finished".

Its main genres are adventure, mecha and sci-fi, with themes such as Robots, Tokusatsu, Superhero and Reincarnation.

On AniList, Casshan: Robot Hunter has an average score of 59%, an average score, and appears on 3,307 users' lists.

In the near future, robot technology has advanced to the point of self-awareness. Under the leadership of the "Black King," machines have decimated the human population and conquered the world. Those who survived the early holocaust have been enslaved for life. But throughout the hardships, a lone hero appears as the savior of mankind. He is Casshan - a fusion of man and machine driven to combat Black King and his forces to the end. (Source: Anime News Network)

Official synopsis from AniList.