Hi, Hello, Bonjour. It's me the person who uploads the chapters. I have seen and read the comments critizicing the way that the chapters are listed and such. I would like to explain what the ideal order is and other things that are related to the story.
First of all, the chapters are divided by volumes so the order is Volume 0, 1, 2, 3 (for now).
Second, the extras divided by what kind of extras they are in volume 0.1, 0.2 and 0.3. They are not mandatory to read, in fact, with the exception of the Timetables and maps, the rest is non-canon to the main story. They are a nice read nonetheless.
The author has released extras related to the story, and are canon, but those are exclusive for its paying supporters so I won't be publishing those. Only those things which are available publicly, that being said I won't be publishing the previews to extras because I would be giving an unfinished story and because even if i used it as an advertisement of the author's pages which you can support monetarily, those pages that you will pay for won't be translated nor edited.
Thank you for reading this post and I hope you enjoy the story and consider supporting the author.