reading 2 chapters of the serialization, it went deeper on this and is more complete (longer chapters too), there she stated that she is a 5th grade 10yo in the very first chapter, so is the same here, just skipped that info and just put in those rectangles with their names and ages as if they know that already
chapter 1 is 14 pages, with 4 of them being the same as chapter 1 from this, so the rest is all new story or info about her