The main feature is the character development. The main character starts from a particular point and as the story in Volume 1 progresses, we see how he adapts to the new world. His decisions and actions shape the story. Also, the power system in the novel is well - defined. It adds an extra layer of excitement as we see the characters use their powers in different situations.
One main feature is its unique world - building. It creates a vivid and detailed fantasy world where the story takes place. The characters are also very distinct, especially the main character. For example, his powers and his role as an overlord in this new world are quite interesting to explore.