This is my first read with this type of character and genre, so please forgive me for not agreeing with those who have rated this lowly. I, personally, find this to be a breath of fresh air and a wonderful read. I am loving the character and the pace, agree that it seem a bit fast, could have been slowed down a bit with the experience gains (that she later uses for the reincarnation events) being shown, and possibly surprising Rare.
Also, is this skill available to all players? I would think that for world development that this "Subordinate" skill should/would be only available to the first character to get it. If other players could research and get this skill, wouldn't this "game" world be overrun with "Demon Lords" and "Spirit Lords" rather quickly?
Anyway, I have rated this highly as I have enjoyed it thoroughly thus far and am really looking forward to much more from this manga. I think some tweaking is needed to the plot presented here (it may be explored more deeply in the novel, I would love to know where I can find that!), slowing the pace down just a bit, and the art I've felt has been very good (kudo's to the Artist!).