Visiting Japan - Tokyo in 2 months. What accessories-gear should/could I buy there?

So first of all I'm Hungarian so my main websites for Airsoft are Taiwan gun, Gun Fire and Airsoft pro.

I'm mainly looking for mask/helmets with Ventilation/Fan. However since Japan is the birth place of Airsoft I figured it's worth asking what other stuff I should buy there. (mostly cosmetic since I don't want to get in trouble in airport security)