So World's End Harem is a series about a man who wakes up in a world where the MK (Man Killer) Virus has decimated the population of men by 99.9%, there's like 1 million men remaining in the world. This is explained in an exposition dump. Our character wakes up, and is surrounded by women. Many women who barely wear clothing.
They start off introducing him into the world where they take him outside, where a woman throws herself at him only to be hit by a taser. I don't know if that was meant to be comedic or horrifying, it just came off odd. Our protagonist is put off by this, and right away you just know how it's going to be.
Women are constantly approaching him, coming onto him, even the woman who is supposed to be his caretaker wants him, but no. This is an anime man, so he refuses as much as possible. If you watch the uncensored version there's a lot of breasts, but that's really all there is for nudity. At one point the protagonist suffers a scratch and one of his bodyguards rips off the bottom of her shirt to wrap his wound, which exposes her breasts. This series is pretty much H, but because they don't show (or blur as is usually the case) genitals, it's classified as ecchi instead so it can be played on TV (in Japan that is).
Pretty lame loophole, and pretty lame anime. It's got nice art, but the story exists only because it's expected to be there, and this is pretty much just borderline adult material that goes soft to avoid the adult rating.