Can I level up my Inner Ability?

I got a Special Circulator once. But it gave me double C lines =\ So much for the hype to use it when I got to level 30

Special Circulators are so rare, I've only seen it 3 times over 1500+ runs checking the shop every time. You should save up all your coins so you can buy as many as you can whenever you see them.

You can only buy it once (until the next time you find it again)