Read the first chapter of something called Billionaire Girl. It's about a college guy who ends up tutoring a girl who's made a ton of money playing the stock market. The characters seem realistic, and I like the art. I also like the premise of the romance because of the age gap. I can't figure out what the demographic is, though. I think it's seinen? But there's none of the usual ecchi. Well, it doesn't really matter, I like it.