I don't know as I haven't read the book. Maybe there is a central returner character, and around them could be friends, family, or foes that play important roles in the story.
I haven't read it yet, so I'm not sure about the main plot. But generally, it might be about a character's journey of returning, perhaps to a place or a state, and the adventures and challenges they face along the way.
One thing is its take on the theme of'return'. It's not just a simple homecoming but a complex exploration of a character's past, present and future in relation to this return.
Maybe it's a person who has come back from a different dimension or time period. They are trying to understand the current world through reading light novels. They might find the concepts and stories in light novels both strange and interesting as they compare them to their own experiences.
In the 'a returner magic should be special novel', the special returner magic might be portrayed through its effects on the environment. When used, it could make wilted plants come back to life, with their leaves unfurling and their colors brightening. Also, it might be shown to have an impact on people's mental states. Those who witness the use of this magic could feel a sense of calm and hope, as if something long lost is being regained.
In this novel, the returner magic might be special because it could be a rare form of magic that only a few possess. It could have unique abilities that set it apart from other magics, like the power to reverse time on a small scale or heal wounds that are otherwise incurable.
It could be described through its appearance. Maybe the magic has a distinct color or shape that sets it apart from normal magic. For instance, it might glow with an otherworldly hue, indicating its special nature.
I'm not entirely sure as I haven't read it in detail. But generally, it might be about a character who is a returner, perhaps someone who comes back to a certain place or time, and their adventures in that context.
The specialness of a returner's magic could also be in how it interacts with the world around them. Unlike regular magic users, returners might have a different perspective on the world, and their magic could reflect that. It could interact with the environment, other magics, or people in ways that are not typical, creating a sense of wonder and uniqueness.