A slightly older game, but easily among the best. You play as Feena, the titular sacrificial princess, as she's about to offer her life to the spirit Demea to save the land from the Dark Lord. Unfortunately things don't go quite to plan....
Story wise, it's pretty good for a H-Game. Defeat the Dark Lord, save the world, it's a reasonably standard rpg afair set apart by it's fairly dark setting and tone and a few neat twists from your standard adventure. It's not a game I'd just play for the story, but it keeps you engaged enough to get you from scene to scene.
The gameplay is pretty neat. There are several jobs to unlock which provide different bonuses for different styles of play and there's a few ways of beating enemies in combat. Enemies can try to sexually assualt feena in battle and you can learn to bear out their attacks or even strike back, or beat them down normally with a variety of skills. However there's only one way to learn skills, Feena can only gain them from monsters in an exchange of mucous membranes. I think you can tell where that's going... Outside of combat there's a large set of maps to explore, with a fair few neat little secrets to find. There are also skills you can use outside of battle in certain locations, where you roll for success similar to ttrpgs. There's quite a lot of different systems at play and they all work pretty well.
In terms of the porn, there's an awful lot there. I already mentioned the combat sex, but there's a huge number of events to find! There's also a decent range of different fetishes, however one that a large majority of the scenes share is that Feena is rarely an enthusiastic or even willing participent. Get beaten by monsters, get punished for crime, sleep in a shady inn, the list goes on. If that's not your thing I'd highly reccomend giving this a miss. Most of them focus on Feena, but most of the other characters you meet have a bad time of it too. The art is pretty unique, and in my opinion fantastic.
All in all, easily one of the best h-games of all time, however if you get queasy about certain subjects then you might want to give it a miss. Take a look at the sample images and if none of them are a red flag for you then pick this shit up immediately!