Most free downloads are not the full game. They are:
Avoid random links found on the first page of search results that lead to suspicious "warez" sites filled with pop-ups. The safest places to find the game are: NTR Knight Free Download
This article is for informational and educational purposes only. Downloading copyrighted visual novels (eroges) without purchasing them may violate copyright laws in your jurisdiction. We strongly encourage supporting the developers (ZION, in this case) by purchasing the game legally if it is available in your region. Most free downloads are not the full game
An Exploration of NTR Knight: Understanding the Game's Mechanics, Community, and Cultural Significance and Cultural Significance