This is really fascinating. It's interesting to see how much the Japanese market is driven by the consumer -- they have a massive market for books, comics and games for the female audience, while in the Western world, despite similar demographics of female gamers and comic readers, the market remains very male-focused. It's led to a lot of interesting splits, with YA novels in the West being marketed with manga covers in Japan, and Western games like recently award-winner Life is Strange using a Japanese publisher because nobody in the US would take a game with a female protagonist.
It's really interesting to watch how the different markets grow. The Japanese market isn't without its own issues, especially a lack of diversity due to Japanese social expectations and inbuilt prejudice, but it's quick to throw aside prejudices when a commercial opportunity presents itself.
I think we've got our own type of 'business novel' here in the West, but it's a lot less fun. There's a long tradition of literary fiction using the cold grey cubicle office as a metaphor, and portal fantasy books like Neverwhere jumping from a dull 9 to 5 into an exciting adventure. Balancing the day job *and* ninja baddies sounds like a great, fun story!