Hentai isn't real women so there's always consent implied because the plot calls for it.
I suppose it helps if you like anime too though. The style is very similar.
Hentai usually has some cheap plot better than most porn. And none of that "I ordered a pizza but I forgot I have no money." nonsense.
There's one where a guy is given some device that stops time so he immediately go to a high school to have sex with everyone.
There's this one where a guy is invisible and follows women around into a bath house.
The typical harem scenario where a guy moves back to his old village where he's one of the only men at their school and gets taken advantage of by all the sexually aggressive women and childhood friends.
From recent memory, there's one where (I guess, I wasn't paying too much attention), the Government discovered men do so much better at their jobs when they have unlimited access to unload their sexual frustration that they basically send women to be set up like barn animals to be humped any time by anyone to exploit this.
Oh, the one I thought was kind of amusing was the one where allergies present themselves as these sexual "pollen people" who basically molest people instead of them simply sneezing or coughing. So basically they're being exposed and engaged in sexual activity everywhere and anywhere and people just try to ignore it.
Most 'regular' porn is basically all the plot written in the title. And I've come across identical videos with multiple titles and realistically it doesn't make a difference. Any two people having mission intercourse can add "drunk, brother/sister, father/daughter, cousins, prostitute, neighbors wife, teacher/student, ect. ect."
All that you really need to know are their names if you want to see more of the same person(s).
It would be more interesting to just flip through static images of women (or whatever you like) in the same pose and show like 120 people per minute in an hour long video because most porn is just as meaningless.
I think that leaked celebrity sex tapes, nip slips and nude scenes are more interesting because you feel slightly more invested and familiar with the individuals than any random nameless dismissible porn star (or amateur nobody). And it's clearly not because their bodies are any (that much) different than anyone else. But I'd much rather see Emilia Clarke's boobs in Game of Thrones than anyone who looks identical to her just placed in some porn video doing absolutely nothing different.
So with hentai, even if the story build up is lame, at least there's something to connect with.