One great source is children's literature. For example, the works of Roald Dahl like 'Charlie and the Chocolate Factory' are full of imagination and positive values.
The significance of the 'real Nagin story' could also be historical. Maybe Nagin was involved in an important event in a certain era. If it's a story passed down through generations, it might preserve the memory of a bygone time and the people in it. Without proper knowledge of the story, it's just a mystery regarding its significance.
I'm not sure which specific 'real Nagin story' you are referring to. There could be many stories related to someone or something named Nagin. It could be a personal story, a folktale, or something else. More context would be helpful.