I spend the first few coupons to get GNW TenTen and/or Iruka fast then save the rest for Lucky Board. It's really worth it.
Iruka fast is a good idea as he will help you to get possibly top 3 in 9 tails so you can get even more coupons. In a sense he pays for himself over the long run.
After that, just like everyone says spend on lucky board only and you will win this game.
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