Great Mazinger (Rippu Dynamic Comic). Thanks to MD for volume 1. He wrote:
The second volume of Great Mazinger is from the Nagai version (2 volumes).
The 4 volumes you uploaded is the Nagai-Gosaku Ota version
DDL (MF folder): http://www.mediafire.com/?v9ybbgf1c8uqt
UPD: for some reason MF cuts filename for vol 1. It should end with .rar, But I can’t add last letter.