Yes, it started from a single song! Haha. He's in a game I love too though - Samurai Warriors. I only got into that around Christmas though. Amusingly enough, I bought it because I loved Hyrule Warriors - Oda Nobunaga being in it was just the icing on the cake... and may be the reason I've spent around 150hrs on the game and I'm still not bored. >.> That's cool about your friend! I wanted to study it formally but lacked the grades to take a traditional route into higher education. ): Uh, that's an open-ended question haha. Various aspects of pop culture, food (cooking it!), classic literature, geography, politics, structure of modern society, etc. History is definitely the main one though! I adapted a short story into a screenplay for uni last year, set in Kyoto in the 1860s, which gave me the perfect excuse to do more research into the Edo period and Meiji Restoration.
What is it you're really interested in?