Steam game

Sanctum Protocol

After the cataclysm known as The Breach, a young civilian awakens the power of the Guardian to purify demons. Fight alongside the warrior nuns or surrender to forbidden pleasure... every choice will shape your corruption and the fate of the world.

$4.99 March 27, 2026

By Koisoft

Windows
View on Steam
Sanctum Protocol - Koisoft. Popular. Released March 27, 2026
Screenshot of Sanctum Protocol gameplay showing in-action mechanics Screenshot 2 of Sanctum Protocol - additional gameplay view Screenshot 3 of Sanctum Protocol - more gameplay footage Screenshot 4 of Sanctum Protocol - final gameplay screenshot

Overview

About this game

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.

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.

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