Yes, it is. Build an entire adventure game without writing a line of code now is possible with this plugin for Unity 3D.
No, no is free (it costs 70$) but is available for both Unity Free and Unity Pro on the Asset Store of Unity 3D website.
This is the website of creators:
http://www.iceboxstudios.co.uk/adventure-creator
An this is the link of Unity 3D Asset Store:
https://www.assetstore.unity3d.com/#/content/11896
A new tool for adventure developers.
Best regrads, Vairon.