These photos are from the ski slops of Nagano Prefecture. Besides the cosplaying snowboarders, there are geeked out snowboards, called “ita-board”. They feature anime and video game characters.
“Itasha” (痛車), or literally “painmobile”, are cars covered in nerdy decals and stickers. These are the snowboarding equivalent.
Some even dressed as characters, like Pikachu, as they hit the slopes.
According to Japanese website 2ch News Flash VIP Blog, over 80 people participated in this event.