If you've ever wanted to read a manga about a young otaku in highschool with no social life getting powers from a girl from hell who is collecting a resource that comes from the negative aspects of girls' lives and the otaku must assist her by solving their emotional issues and gather this resource or else he'll suffer extreme physical harm, with each girl being tossed aside after being "conquered", have I ever got the manga for you:

Kami Nomi Zo Shiru Sekai.

Oh and also this blatant derivative which isn't quite as good but holds up alright.

To highlight the quick differences: Kaminomi is romance. This is Ecchi BDSM. Both focus on the emotional stories, but Kaminomi focuses more on real world issues like depression whereas this focuses on traumas that led to girls becoming "bad girls" and criminals. As such, kaminomi has the edge in terms of realism (heh) and relatable stories, whereas this one is more ecchi. Neither abandon story, but Kaminomi is definitely better. Meanwhile in terms of art, they are both great.

Kaminomi wins in terms of characters as well; having to make the villains clearly bad girls immediately after you meet them hurts Oshioki considerably, as the introduction of all the characters is very black and white before it gets into their root problems later on. Pacing in Oshioki is also an issue; it has been quite fast so far with not enough time devoted to the investigation part wherein he discovers the problems; instead it opts for a more mystery-novel-like "tada!" moment wherein he exposes it to the audience.

All in all, if you haven't read Kami Nomi, read that. If you have, this is a worse version, but considering Kami Nomi is a manga I'd give a 9/10 to, that's not saying a ton, and I'd still recommend this, assuming you can stomach over the top ecchi fanservice.