At Japan servers shop sell keys for briefcase -Our server dont sell keys. bug ??

When buying one N-Gacha players get one N-Key(pink key) as a bonus. This apply also if bougth with pero.
When buying R-Gacha, SR-Gacha, E-Gacha player get R-keys(silver key ) and SR-Keys (gold key) as a bonus.

From spins players get a lot more briefcases than keys so to open all briefcases players have to spend money.