Devilman manga was first produced in 1972. It spanned 5 volumes and 1352 pages. This extremely violent manga with a story stood out and was an instantaneous hit. The manga was so popular that it became its own anime series in that same year. The television series aired from July 1972 to March 1973.
Two Devilman OAVs were released (1987 and 1990) that contained more violence than the TV censors from 1972 would allow. They cover the origin of Devilman as well as his epic battle with Siren. Except for a few minor details, they are faithful to the classic manga.