Hello!

There's a lot of items you can buy in Am(us)ement Park with great use such as power-up items but I'd suggest you to better hold on to your coupons right now and spend it next time when Fukurokumaru's Deal is available. That way, you'll gain more valuable items while spending your coupons. However, Discount Vouchers expires after the event ends so it is up to you whether you spend it right now or not. Thank you.

* Secret Scroll Optional Packs or Training Potion Packs are worth spending for.