This OVA series has to be one of the most underrated anime ever. Although at first glance this may seem very stupid, but actually its very funny. It takes "Devilman" a very serious show along with "Mazinger Z" another series show although it did have some comedic moments and basicly parody them along with their creator Go Nagai himself. Plus although I doubt anyone will count this as cannon, but it also bridges the gap between "Devilman" and "Violence Jack" another work of Go Nagai. The only minus I can see is that if the person watching isn't aware of anythingDevilman, Mazinger Z, Violence Jack, or even Cutey Honey related then they wouldn't get pretty much all of the jokes, so only GO Nagai fans will be able to enjoy this.