look you can get it for free .... I explain ... in the greate plate event ... he was there, I got 10 frags something like that ... the pack they give you when using 500 keys gives you 4 pack containing 16 frags from kakashi summer..the pack contains several ninjas you choose the one he wants ... that pack changes sometimes .. I show you the pack that I speak .. you only need 3600 coupons and you earn irems and frags valued all over 30k in coupons up to 50k. you only spend 3600 coupons .. in this image I show you sometimes it changes .... and here is a link, to my video of this week's greate plates event ..https://youtu.be/rl0FVhArtHo .if you see at the end of the video I have 8 packs I am saving it if something different comes out or when I have enough I get sasuke 5 stars .. the greate plates event helps you get 2100 keys to use in all events and refines and vials as you see in the video.and if you look at the. pack x4 that they give you when using 500 keys .. it is valued in 3600 coupons ..