First of all, the book itself is a unique and difficult concept that writers can venture upon. However, author-san made it interesting with the hype and suspense. Character-Wise, I see no problem and each has their personality fairly justified and seen in real life. World-Building might need a bit of work although the majority is understood. For example, in the early chapters, I'm still confused as to the settings of the world, is it a magical world with floating islands, etc.The writing Quality is well, the novel just needs a bit of proofreading as some words are either not supposed to be there or spelt wrongly. Sentence structure might be an issue, some parts, IMO, sound weird.However, overall it is a great novel and I love to see where this story goes.Good Job