Yeah I really wanna learn D3.js as well :), but it's a big nugget to crack coming from a non-programming background. I'm not living in Japan actually, sorry that was a miscommunication :D. I would love to one day, I just visit every year or so. I live in Austria, where I grew up. But I'm hoping to move to either Japan or Korea soon. Where are you and where are you hoping to go? :)
PS: Collaboration would be fantastic! Let me know what kind of topics you are hoping to cover!