They didn't get married, but for all intents and purposes are married.
Meg, what kind of logic was that? No wonder Jin grew a beard. He probably got depressed that he couldn't properly marry his girlfriend. And for 5 years even! Well, at least getting to the world tournament will get them married, so now he has the motivation to clean himself up!
It looks like he knows his game design and game interactions well if it seems to translate to multiple kinds of games. He also has an idea for how to utilize Yamano's unique skills! Just what does he have planned?