Gekiman!: Mazinger Z no Shou

One of the first Super Robot manga and the one that introduced most of the traits of the Mecha genre. Constructed with the Super-Alloy Z, Mazinger was built by Professor Juzo Kabuto as a weapon against the Mechanical Beasts of the evil Dr. Hell. Koji Kabuto, the grandson of Professor Kabuto, becomes the pilot of Mazinger Z when his grandfather is killed, and battles from there on against Dr. Hell and his allies. This is the first series that introduced the concept of a pilot inside a Mecha, which all series from then on have followed.

An autobiographical manga about the career of Nagai Go and how his most known works were born.

How a young Nagai Go, struggling to break out of his typecasting as the go-to guy for gag manga by breaking into the sophisticated world of story manga. 

*Note: This part of Gekiman! mostly focuses on Devilman.*

An autobiographical manga about the creation of Cutie Honey.

A remake of the original Mazinger Z manga in celebration of its 50th anniversary. This manga is the in-universe story of the manga that Gekiman creates in the autobiography manga Gekiman! - Mazinger Z Chapter