The way I see it, the mana vision skill is the minimum skill required to solve the puzzles, actually solving the puzzle is basically a 'can you pay attention at all?' test, this is just to eliminate those who don't even pass the the most basic of requirements after all, the real test is later if...
The implication I got from the first chapter is that the moment the system started working everyone else was let go and Satou only stayed because the overworked manager must have convinced the old boss they needed someone to do maintenance and Satou was the one with the best knowledge.
At that...
Thanks, I was interested in this manga, but I've long since lost the patience to search for chapters in each and every group's site(that may or may not still be up) that decides to purge only the first chapters or the middle of the story.
It's almost like the tea was especially made to react badly with her medicine, and he did say that her medicine is being studied a lot, it is really easy to cause a bad reaction and then discredit her medicine as defective, especially if important people suffer the effects
oh god this is a lot more fun than I expected, also, that achievement reminds me of that time I (as a gm) attempted to kill a player, but the bastard did a perfect run of the challenge so I just had to reward him, because "fuck! that was amazing"
I honestly assumed she her mother at the start of the chapter, that's one hell of a growth spurt.
also, my guess is that they're either married by elf law or at least engaged, and she had to actually change her name because you can't have an outsider with the name of maple