Devilman

It's basically a series of gags based off of NAGAI Go's Devilman.

From ja.wikipedia: The manga tells the story of Ryo Utsugi, a student who finds himself in the body of an ancient demon known as Dante and sees himself in the middle of a conflict between God and the devils.

Dynamic Heroes is a digital manga by Kazuhiro Ochi that presents the most notable characters from the franchises by Dynamic Productions in their anime format in a massive crossover. It involves the series: Devilman, Mazinger Z, Cutey Honey, Great Mazinger, Getter Robo, Grendizer, Demon Lord Dante and Dororon Enma-kun.

Pairing: Amon x Satan

Pairing: Ryou x Akira

A Mercedes-Benz SLR car ad by Go Nagai featuring Devilman.

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.*