This game is heavily focused on impregnation, pregnancy. If that's not your thing, turn away.
As a game with pregnancy mechanics, it's pretty solid. However, as the technical successor to the developer's previous game, Silent Pill, this feels like a step down in every sense of the word. Despite being a continuation from a CG story set that the dev has made earlier, the story comes off as lackluster and weak.
In this game, you play as the Pig Demon General, who honestly looks like the most generic pig orc I've ever seen in any eroge or doujin. As it were, the plot is that you take it upon yourself to start building up your army of raping and pillaging orcs by raiding a few villages to resurrect the reign of the Pig Demons from generations past. However, your attempts keep getting thwarted by this busty samurai chick by the name of Shizuka Hiiragi aka the only person you can fuck in the entire game. In typical hentai fashion, you catch her off-guard and bind her to your will via McGuffin magic that you gained by eating a sorcerer a while back. From then on, it's time to begin your quest for domination in earnest...
...and it only revolves around a pitifully small selection of areas. There's the abandoned house you shack up in, the castle town, the forest, and this cave labyrinth where you can grind levels in with strong monsters. Grinding is also prevalent in this game since it's not only needed to level up but also a requirement for story progression and the only way to even get the Soul Spirit items needed to accelerate pregnancies. The only positive that I can think of when it comes to the combat mechanics is the unique skill selection that varies on Shizuka's stages of pregnancy though that only comes in late game.
Speaking of pregnancies, the sex scenes in this game are laughably sparse compared to its predecessor. Don't let the number of crystals in the recollection room fool you- they're all just the same 3-4 scenes but with different pregnancy stages and different dialogue based on whether you've exceeded 100 horniness points. This isn't to say the art is bad since it is a delight to behold, but it is sorely lacking in variety. Same goes for the Soul Spirit mechanic since while it's a nice layer of complexity to the pregnancy system especially in combat, that's really all there is to it.
Comparisons with Silent Pill are also inevitable since anyone that's ever played it will notice how strikingly similar the pregnancy mechanics are and also the existence of different variants of scenes based on pregnancy stages and horniness levels.
However, as mentioned previously, it feels like a cheaper version of that game. It has a H-Status screen that displays sex data and belly size differences but lacks the x-ray view of the fetus and ovum the last game had. Silent Pill also had repetitive scenes but it more than made up for it with the variety of different monsters that can violate the female MC as opposed to the singular orc that fucks Shizuka. Not to mention that the scenes in Silent Pill also showed other characters getting violated which helps set the tone for the game as opposed to this game where it only comes in the beginning flashback and the end when you conquer the castle. This game may have some unique combat mechanics that revolve around pregnancy, but the predecessor beats it in spades in that department with a whole slew of mechanics dedicated to pregnancy.
It also doesn't help that the story takes an unconventional approach to progression and not for the better. Where most standard RPGM games have you completing a quest and moving on to the next area, this game has you stick to the same area and click a goddamn icon to move the story along. Rather than organically placing hints in the world to get players to talk to NPCs and naturally have cutscenes progress, the game outright halts the plot and tells you to complete XYZ objectives before you can click the plot icon again.
All in all, pretty okay game but just go on some hentai site if all you're looking for are CGs. Much better use of your time that way.