These are different stories involving Devilman's world. Some are about Devilman and add to the mythology some are separate stories that don't involve Devilman but take place the same time as the events in the original Devilman manga. They are illustrated by various artists. There are some color pages in the start middle and toward the end. There are some truly amazing art and stories in these volumes. 
Number one is written and illustrated by Lazy Hagawari, Tatsuya Egawa, Katsuya Terada, Ken Ishikawa, Go Nagai and Shinichi Hiromoto. 
Number two is written and illustrated by Hitoshi Iwaaki, Noriko Nagano, Go Nagai, Akihiko Takadera and Kazuko Yumeno. 
Number three is written and illustrated by Noburu Miyama, Miki Toro, Shinobu Kaze, Sho-u Tajima, Masaomi Kanzaki, Yoshikazu Yasuhiko and Iou Kuroda.

Hordes of demons, once thought entombed forever in the underworld, have now returned to Earth. Evil and corruption begin to seep into our world, as demons seize human hosts. Mankind’s only hope for salvation is to use the demons’ power against them–and only a pure-hearted man like Fudo Akira can do so without losing his humanity. Once little more than a crybaby, Akira now wields the terrible power of a devil, yet holds the innocent soul of a man–Devilman! 
 
(Source: Seven Seas Entertainment)

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