I'm not entirely sure as it's not a widely known mainstream novel. It might be about a character's experience with leveling up in some sort of game - like world, where the leveling - up process has some strange or interesting aspects. But without more context or having read it, it's hard to be more specific.
If it's a relatively new or niche novel, it might be a bit difficult to find. You could start by checking online platforms that deal with Japanese literature, like Amazon Japan. There are also some independent Japanese book - selling websites that might have it. Another option could be to check with libraries that have a good collection of international or Japanese - specific books. However, you may need to do some digging as it's not a common title.
In certain fanfic concepts, Naruto could learn Edo Tensei from Kabuto. Kabuto, having mastered the jutsu, might decide to teach Naruto for some reason. It could be because he sees Naruto's potential to use it in a more positive way compared to how he misused it. Naruto, with his strong sense of justice, would then try to modify the jutsu to be less evil - like not using it to bring back people against their will.
Hard to say. It could be on hiatus, but without concrete information, it's difficult to give a definite answer. Try following the mangaka's social media or the manga's official website for the latest.