At EG they put Wako in Event gacha, when she was shouln't be useful for events. They released it again to N gacha once i spit the screenshot on their FB

And is a problem, Event gacha cost the same than R gacha (ignoring daily deals) and has a worse success rate for everything (because joins cards from N gacha + cards from R gacha + exclusive cards from event gacha). At least R gacha guarantees R cards.