I don't have enough information to say exactly who Miu Sakamoto is in this context. They could be an author, a storyteller, or someone involved in creating this 'never ending story'.
Sakamoto and Kouta are likely characters that fans have created a relationship for in fanfiction. They could be original characters, or perhaps characters from an existing series that the fanfiction writer has chosen to pair up in a new and creative way.
The 'Sakamoto Days' novel is mainly about a former top - tier assassin named Sakamoto who has retired and become a fat, unassuming man. But his past catches up with him, and he gets dragged back into the dangerous world of assassins. It's full of action, interesting characters, and unique fight scenes.
The main character is Sakamoto, of course. He's the ex - assassin. And there are other assassins who play important roles as well, like Shin. They interact with Sakamoto in various ways, either as opponents or sometimes as reluctant allies.
Typically, light novels can be recognized by their relatively fast - paced storytelling. They usually have a good balance between dialogue and description. For akira sakamoto's light novels, if they are like most in the genre, they may have engaging plot twists and characters that readers can easily empathize with. This can make the reading experience exciting and immersive.
Since there's not much information given about 'miu sakamoto the never ending story', we can only make some general speculations. It could be a personal project of Miu Sakamoto. The 'never ending story' part makes me think of something that has an infinite quality. It might be a story that explores themes like time, eternity, or the cyclical nature of things. For example, it could be a story set in a magical world where time doesn't function in the same way as in our world, and events keep occurring in an unending loop, with characters constantly evolving and facing new challenges without a true end point.
A more light - hearted fanfiction could be based on a school setting. Imagine Sakamoto being the new transfer student in Kira's school. Kira is initially suspicious of Sakamoto but then discovers that they both have a shared love for a particular type of music or art. This leads to them collaborating on a school project and their relationship blossoms from there.
One popular 'sakamoto desu ga' light novel is the original 'Haven't You Heard? I'm Sakamoto' light novel. It has a unique story that follows the incredibly cool and composed Sakamoto in his high - school days. His actions are always unexpected yet so smooth that it makes for an interesting read.