Sanctum Protocol
Koisoft · 2026 · Visual Novel, Sci-fi, Demons, Supernatural, 2D
PC
4 user reviews100% · 4
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About Sanctum Protocol
After the cataclysm known as The Breach, portals opened to a dimension of corrupted pleasure, unleashing demonic entities that shattered the spiritual balance of Earth.Humanity’s last hope lies with the Order of the White Lance — warrior nuns who combine faith, sacred technology, and combat to contain the corruption.You are a young civilian who, after an encounter with a succubus, awakens the forbidden power of the Guardian: the ability to purify demons through the body.The nuns believe you might be the key to salvation... but a mysterious figure watches your every move.💠 Every choice you make will shape your power, your corruption, and the fate of the world.🌟 Sacred Path – Fight alongside the Order, purify demons, and strengthen your bonds with the warrior nuns, who take their sacred form.
🌑 Corrupt Path – Surrender to forbidden pleasure, drag the nuns into corruption, and follow Lilith’s call, witnessing their corrupt transformation.
🌑 Corrupt Path – Surrender to forbidden pleasure, drag the nuns into corruption, and follow Lilith’s call, witnessing their corrupt transformation.
Key Features
- Adult visual novel with moral, sexual, and spiritual choices leading to multiple endings.
- Purification System (NSFW): purify demons through pleasure while your own corruption progresses.
- Explore the Sanctuary and the city: each day you must choose your actions — talk to someone, train, or rest? Your limited energy creates opportunities for replayability to explore different outcomes.
- Deep relationships with the main nuns: Elysia, Noa, Malina, and Caelia — with romance, betrayal, and mutual corruption routes.
- Character transformation: depending on the path you choose, the nuns will change their form and personality between sacred or corrupt versions.
- Dream visions gradually reveal the prophecy and the origin of the Protocolum Sanctum.
- Dark, provocative anime-style artwork, carefully reviewed and curated for consistency and quality.
What Steam players say
Recent verbatim reviews from Steam — separate from playze.io community reviews below.
A admittedly short, but still quite decent game, where both choice and commitment to said choices matter. I personally loved the soundtrack as much, if not more so than the core content of the game. The existence of multiple endings gives it some replayability. The story is surprisingly pretty good for what it is, and if you find the idea of having nun companions appealing, be they pure or corrupted, you'll definitely like this. And all things considered, the price is good. There are some kinks and small glitches that need sorting, but in my experience, none are game breaking; would still be nice to see them fixed. A personal pet peeve of mine; I am generally not fond of AI, though at least here, it hasn't been used as a heavy crux for the game. and the previous points are enough to make up for it. So if only to support the kind of themes this game has, I recommend giving this game a try.3 found this helpful
It's a small one dev game which uses AI art, but its story is not bad at all if a bit cliché. The execution was rather competent and the soundtrack is surprisingly awesome, almost wish you could buy it.2 found this helpful
Just for note, I had to throw a dice to decide if I should give this game a positive or negative review. It should be a "neutral" review but steam does not have that option. I roll even so as I decided even numbers will be a positive review so here we go. Well, I am not fond of games with AI generated images but I thought that I should maybe give it a chance. Sanctum Protocol had a theme that is not so popular and is to my liking so I selected this game. Well, it was an ok experience. I completed this game two times, corrupted and sacred path. I believe that there are some more endings to see but I had enough. Corruption ending was satisfying where sacred nos so much. Pros: - OK story. Nothing really that good but serviceable enough. Kind of animeish and quite straightforward (no surprises). Only one thing that I would like to have is to have more impact on that story. To feel that my choices matter. Even now I am not sure if some of the options had an impact on anything. - Interesting soundtrack. I wonder if this was AI made or if it was taken from somewhere. - Uncommon theme. There are not so many games that focus on corruption that revolve around angels and demons. It is handl…1 found this helpful
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