Japanese food! Bento or Ramen or Sushi!
Cosplay costumes! I need a new pink wig!
Cosmetics! I look so awesome...with makeup!
Mangas/Comics... hehe, I'm a collector, you know.
CD/DVD or Blu-ray of Japanese Anime/Movie/Music...
Copic markers! I love drawing!
I'd spend it with my buddy in a bar! Bring some beer, dude!
I'd save it for future use, of course!
I'd buy one manga, one onigiri, one bubble tea, and take purikura with friends.