Yes, the base is free to play. However, like many idle RPGs, it uses a freemium model.
: Users can download the official Nutaku Android Store APK to access the game as a dedicated application. This version provides a more stable interface compared to standard mobile browsers. Core Gameplay Features
Is there interest in learning more about the RPG mechanics or general strategies for team building in this type of game?
: Characters in your harem generate money over time, even when you aren't actively playing. How to Download and Play
Only download the official Nutaku app or play through their verified web portal.