Wow, didn't noticed there is a thread for 9S! Thanks for making one. Its really hard to search for it in any search engine with its name. Didn't expect to find this when i was googling Mineshima Yuu for fun xD.
This is in fact my favourite light novel among all that i have read so far. I love the character settings and how they interacts. Story and plot setting wise, the authors really did well in setting the stories and the Legacy related stuffs. There are many things that people normally wouldn't expect or think that detailed.