If you're like me and sick of the not having enough energy to keep up with the Japanese players who can just buy more. There is only one option buy JP PSN Cards but question becomes where is the best place to get them?
I've one that looks good where the guy claims he'll send you your card code straight to your e-mail within a few hours.
^ like he said its not worth it especially if your playing on your US PSN Account because energy is not DLC where u download it on your JP Account and then its usable on all accounts on your system. It comes strictly from the games store which doesn't get added to your download history and which can only be accessed through a JP Psn Account
But if your using your JP Only Account To Play This Game then by all means buy you a PSN card but just remember your going to have to keep buying them once you hit zero and the prices aren't bad but since they don't make a $1, 2,3,4,5 PSN cards your going to have to keep forking out that $20