Kikaider 01: The Animation is a oVA anime that premiered in fall 2001, produced by Radix.

About the production: the story comes from a manga, there are 4 episodes of about 27 minutes and its current status is "finished".

Its main genres are action, adventure, drama, mecha and sci-fi.

On AniList, Kikaider 01: The Animation has an average score of 63%, an average score, and appears on 1,145 users' lists.

The franchise continues in or follows from: Jinzou Ningen Kikaider: THE ANIMATION and Guitar wo Motta Shounen: Kikaider VS Inazuman.

Ever since the fall of the DARK organization, Jiro has been wandering everywhere and wondering if he would ever see Mitsuko again or not. During his journey Jiro meets a beautiful girl named Rieko who is protecting Akira, a little boy from the evil Professor Gill. Ironicly, he's the son of Professor Gill, but he is also the key to Gill’s menacing secret weapon and his plans to conquer the world. (Source: Anime News Network)

Official synopsis from AniList.