Being able to use magic is rare in the Twisted Wonderland universe, as confirmed both in the novelization and in the game.
The novel explains:
“You mean, magic is something special even here in this world?”
“Depends on the species.” The ghosts looked Yuya over and thought for a minute. “I guess, right. Humans like you, maybe one in ten can use magic? And most of them, I mean, they can basically move a cup onto a table or light a fire without a match. Real small stakes. It’s a rare one who’s got enough magic to get into Night Raven College.”
– The Red Rose Tyrant (Twisted Wonderland novel 1, official translation)
In the game Jack explains, “Even in Twisted Wonderland mages are a minority and most people can’t use magic at all,” while Trey says, “Not many humans can use magic,” which is why they turn to chemistry for things like Fireworks.
Twisted Wonderland Reference Note 