Centoria is really like a ghost xD she is there but doesn't seem to be noticed by the people around her, in chapter 11 i always paid attention to her throughout the story like it was love at first sight, but even the MC didn't seem to have any interest at all in Centoria like WTH, seriously?? In your group there is an Elf with extraordinary charm and you don't even notice her
If i were in the MC's group with a friend from my genmate like Centoria, i wouldn't have to think twice about making her the first target of a harem girl to order her to spread her thighs on the bed