If you're looking for anime similar to Shin Devilman, you might like these titles.
OVA #1 - The Ajin Control Committee's most feared worst-case scenario: "The Shinya Nakamura Incident."
OVA #2 - A special side story depicting the everyday lives of the characters. This will let people see the unexpected and frank reactions that were never shown in the TV anime or films. Taking forbidden peeks at their lives might become a habit!
A recap of the first three episodes of Hellsing (TV), in the animation style of the Hellsing Ultimate OVA.
Thinking of committing fraud? Embezzlement? Murder? Think again. Though crimes often slip through the cracks of the laws of man, the laws of the spirit world are not as forgiving. In the underworld, even the dead can request vengeance against those who have wronged them, at the hands of the Judge, the keeper of justice. Hot on the trails of a corrupt executive, the Judge realizes that the chain-of-command might be guilty as well, causing an investigation of deadly proportions...
In ancient Rome, renowned architect Lucius is down on his luck. He has been fired because his style of buildings is unfashionable, and all the bathhouses in the city are noisy, boisterous places that no longer prioritize relaxation. To get some peace and quiet, he sinks below the surface of the water, the only place where his fellow bathers' chatter can't reach him, but a powerful drain pulls him into the depths! Upon emerging, he finds himself in a vastly different bathhouse, and though the architect believes it's just the slaves' quarter, he's actually been pulled through time to modern-day Japan! Now, armed with knowledge of these strange new baths, Lucius is determined to restore his reputation and revolutionize the Roman bathing culture!