How common is it for fans of Japanese movies to watch a significant number of live-action manga adaptations without realizing they are adaptations?
I say this because I've noticed that a large number of manga have live-action adaptations, many of which aren't very well-known or don't have much value outside of Japan. Obviously, in the case of Attack on Titan, AoT, Jojo, Gintama Cutie Honey, Sailor Moon, Devilman, etc., it's noticeable because of their fame and overall style; you can see that they are adaptations. But there are also many more grounded live-action adaptations like Old Boy, MW, Sanctuary, Dragon Head, Himizu, which many people don't even know are live-action adaptations.