An alternative timeline compared to the anime-version.

Following an accident in the Himalayas, Akira Fudou's body has been taken over by none other than the fearsome demon, Devilman. However, upon living with Akira's relatives, Devilman has come to find himself rather fond of humanity - even if it means getting roughed up by his girlfriend, the Most Dangerous Miki Makimura for acting out, much to the Demon Lord Xenon's dismay. Wishing to kill the traitor, Xenon begins unleashing a series of cruel, grotesque demons unto Earth, and only Devilman stands between them and humanity's demise. Can the reluctant hero save his soul while keeping the city and his secret identity safe? 
(Source: Discotek Media)

Mazinger Z is an alternate telling manga made in collaboration with Gosaku Ōta and Go Nagai, compared to the original and TV Magazine manga by Nagai, this manga was made more in tune with the anime while adding its own original elements.
 
The manga focuses on a plot more similar to the anime starting with Koji checking on his grandfather after Baron Ashura had activated a bomb. With his dying breath, Dr. Kabuto gives Koji the Super Robot Mazinger Z. With the threat of Dr. Hell looming, Koji fights against his Mechanical Beasts and lieutenants with help from Sayaka Yumi and to some degree Boss.

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.

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