"Focus your attention and the card you want would appear on your hand. Smash the card and the summoning would be complete!" this sounds like Persona 4 vibe
The Mission: Become a Reserve Hunter in a month's time!
HE'S ALREADY A RESERVED HUNTER!!!!!! AFTER BEING 1st OF HIS SCHOOL HE BECAME ONE (it's what you said author)
I think the xiao hei is the black card. The black card is a special card that can communicate, maybe one special card/unique for each person. xiao hei is part of the cards system within the AL system.
came from a couple of chapters ahead, damn had to reread to find what the heck Imperial Censor is, It's just a summoner so why can't they just name it like that, where did they pull Imperial Censor from