The class listed below this text, QuestRIBackend.cs, provides a graph editor for the relations between quests in S-Quest. In order to use it, first install RelationsInspector and then place QuestRIBackend.cs into the folder Assets/S-Quest/C#/Editor of your Unity project. Now select Window/RelationsInspector from Unity's toolbar and when the window has opened, select QuestRIBackend from the window's toolbar. You'll then see the quest graph of the active scene, and can start adding and removing quests as well as change their connections. If you have questions or feedback, please use the S-Quest discussion thread.
It looks like this: