Subject 9

Subject 9 is a 3D adult game following a young man in his early twenties who spends at least 21 days at a mountain cabin with his family, culminating in a celebration of his great-aunt's 75th birthday. The game features a choice-driven narrative where player decisions significantly impact the story and content experienced across multiple playthroughs. The developer emphasizes that surface appearances are deceptive, with hidden depths to the plot. The game includes adult themes such as incest, group sexual content, and encounters with multiple female characters, though it explicitly does not contain NTR (netorare) content.