I would consider learning about something you love and advancing your skills useful for your own personal development, and you never know when you can merge that with professional development or opportunities.  Many people far away from their academic years consider that sort of learning (for the love of learning) some of the best choices they ever made.  Good luck!

Japanese as a second language would not be as helpful for a career in architecture as Arabic, Hindi, Spanish, Chinese or Portuguese. The decades long recession in Japan has stagnated the market for architecture, that an a long deep bench of talented designers makes it very difficult for outsiders to penetrate the domestic Japanese market.

Over and OUT

Peter N

Japanese has good language for design though. So as far as stretching the reach of your mind, it is good. But totally not necessary. 

I didn't get a minor in college but I have taken enough classes since then to have about 4-5 "minors". I teach and run a small business so it is good for me to have a wide repertoire, it allows me to connect with so many more ideas and people than I would be able to otherwise. In the recent past it was good to be high specializing, but I think we fractured out our thinking too much and need more broadly educated generalists and designers should be exactly that. Never stop learning. Oh, and as am employer, I hire you, the product of your education, not the education, does that make sense?