"Shin Devilman is a side story that happens sometime in between the main series, before Akira is betrayed".
@Left-Hand-Of-Doom (2018) https://anime.stackexchange.com/questions/44162/devilman-manga-and-novels-reading-order/44272#44272
"Devilman Lady is a series that has to deal with fallout from the events of the original series".
@Left-Hand-Of-Doom (2018) https://anime.stackexchange.com/questions/44162/devilman-manga-and-novels-reading-order/44272#44272
Conclusion to Devilman
Prequel to Devilman
"Neo Devilman, Amon: The Darkside of Devilman, and Devilman: Strange Days are "what if" and side stories that pertain to OG, SHIN, and LADY storylines".
@Left-Hand-Of-Doom (2018) https://anime.stackexchange.com/questions/44162/devilman-manga-and-novels-reading-order/44272#44272
Devilman