I played this a long time ago, at least 5 years and maybe even 10. It's a pretty generic RPGMaker game where you control some sort of heroine who fights enemies and gets raped if she loses. The main map is a (futuristic?) city, and to fight the final boss you enter one of those city buildings. But inside that building if you lose a fight you get captured, and if you're captured you have to sneak around the guards and fight your way out or something, and I think this prolongs the game significantly. I'm pretty sure there is some BDSM stuff at that point, and other women that the villain has captured and keeps for breeding or something. If you lose again you get captured again, and this repeats until you actually defeat the final boss. Or at least that's how I remember it, I'm hazy on some of the details. I think there's a 2nd heroine as well.
Visually I remember the game being colorful like Ankoku Marimokan games, but with less voluptuous characters.
Visually I remember the game being colorful like Ankoku Marimokan games, but with less voluptuous characters.