The demo is basically a skeleton with a boner, and I say that with love. You got your standard fantasy setup, some kind of demon lord thing, and then the succubus shows up. Not a slow burn, honey, she is there to drain you in every sense. The writing has that fan-translated energy where sometimes a sentence feels like it was run through a blender, but the horny parts land. There is one scene where she presses you against a wall and the text just says something like "her tail find your weakness" and honestly? Iconic. Bad grammar, great intention.
The harem tag is doing a lot of heavy lifting for a demo. You meet maybe one other demon girl and she mostly stands there looking like she wandered in from a different game. But the succubus? She is the whole meal. The art is rough around the edges, like someone drew it on a napkin then scanned it with a potato, but the faces during the explicit scenes have this stupidly expressive quality. You know when a character's eyes go all heart-shaped but also kind of confused? That is the vibe. I wish there was a button to just replay the last CG without clicking through the same three lines of dialogue again. There is not. You will click. You will suffer. You will nut.
For a demo it knows what it is. No fake deep lore, no pretending the plot matters. Just demon tits and a protagonist with the personality of wet cardboard, which is fine because the demon tits are doing all the acting. If the full game ever drops, I want a scene where the harem fights over who gets to sit on your face. Not a request, a demand.