To start with, this is a fantastic fanfiction and I am enjoying it thoroughly. Simply put, if you like reading about a journey through fame from the bottom to the top you should read this!
Now for the criteria for rating this:
Translation Quality: Doesn't really apply here the English is fantastic and I honestly haven't found any grammatical errors while casually reading through this.
Stability of Updates: Thus far at chapter 31 the frequency of updates seems rather satisfactory, though admittedly I would love to read hundreds of chapters at once. But alas the author is a human and cannot release chapters at such a pace.
Story Development: One thing I can say is that it started off rather quickly with no real-time beforehand to solidly build up a notable introduction. But I will say that thus far the story has been moving at a very satisfying pace and I find the quickness at the beginning to be a good thing rather than a hindrance.
Character Design: As far as up to chapter 31 I can confidently say that all of the characters introduced thus far are not paper thin but rather seemingly all have their own thoughts and feelings. The bonds and feelings shared between the characters can really pull at you and make you quite emotional.
World Background: As it's anchored in reality and the past, there isn't much needed to further build up the world as it has already happened, allowing one to easily look back on what occurred. Thus far, though, the world feels real and not some kind of hand-drawn background that makes things feel untethered and messy.
In conclusion, read it. Author, if you read this, more chapters pls!