Genre is along the lines of adult, ecchi, hentai.

The MC lost his memory and I think the story starts off by him having sex with a group of women who fight men by using sex. The MC is actually the president of the student council at the school they are currently at for their mission because the group of women fight for justice or something like that. Also the MC seems to get powers (or others as well) get their powers through sex and each women have their own unique ability. Near the ending, the MC gets his original powers back, has sex with the female MC and gets a new power or something which allows him to beat the rest of the villains. I've been trying to find this manga's name for months and I would appreciate it if someone knew what it was or have any idea which manga I am talking about. Thanks! 🙂