Overall: I was pretty high on this game a first. A somewhat whimsical adventure with a cute, haughty, dominant female lead. Then about halfway through more and more of the CGs were "a normal human would've had all her organs ruptured by taking such a huge member" and situations which -- if not ryona -- are certainly toeing the line. All the CGs featuring female NPCs are rape, possession rape, or mind control rape, so the game ends up with a lot less "dominant slut has her way with men and monsters" than I was hoping for.
CGs: Doris gets 1 BP for attacking and 5 for defeating an enemy. With 50BP you can use a Charm skill which ends the battle and triggers a scene featuring the enemy. The gallery is viewable from the in-game menu at any time and BP carries over between battles, so it's pretty easy to unlock and view scenes. Each scene is about a dozen images and loads of text. I felt that even the scenes I liked went on a bit too long. The text box isn't quite opaque enough either, so you'll probably need to hide it really see the images. Or just go into the game files and view the images there.
Combat: Combat is quite solid. Attack, use skills, clothes break based on your current HP% for some bonus lewd. Some of the physical skills get a damage bonus when you're at <40% HP (naked) which can encourage a somewhat risky playstyle of staying at low health. Over the course of the game you unlock new outfits which can encourage a more physical-, magical-, or tank-focused playstyle. Tanking is unnecessary though since you can just blow enemies away with spells and recover your HP/MP after battle if needed. The game throws a lot of curatives at you. You can spend (and reallocate) skill points to level up skills while in town, allowing a decent degree of customization.
The Grind: I didn't find the game particularly grindy. You'll probably grind a little just to unlock the CGs, but after that you can just buy levels or training to increase your magic if you feel you're lagging behind. You could spend your money on equipment, spells, and curatives but you'll find enough through battle that you'll probably only buy 2 spells the whole game. Unless you die a lot. You get better rewards for the number of battles you win between resting in your coffin and dieing breaks the chain.