This is the Televi Land serialization of Kamen Rider X.
Jin Keisuke tries to save his father Keitaro from an attack by G.O.D., but he is shot and killed in the process. However, Keitaro resurrects Keisuke as the cyborg Kaizorg, in exchange of his own life. Learning of his mission from Keitaro's last words, Keisuke becomes Kamen Rider X and battles G.O.D.
