You need an address in Japan, and if you don't understand Japanese, a guide on what to put where.
After that, just add your ID and password to your 3DS to link it.
Thanks.
I had a go at it, and it is more difficult than I thought. You have to type in your name in kanji and hiragana, besides the address issues. I wonder why they made it this complicated with the japanese accounts. IIRC for the european ones you just needed an email address and that's it.
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