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Login to the facebook account with the old save and then logout and it will clear the save data on your device
You need a new facebook account to...
I deacided to start re-rolling for 5*. Wish me luck D:
You need a junk fb account to put the save on, then logout and try again. If you are not satisfied with that roll you need to log in to the junk...
I have never bothered re-rolling in gacha games. I was lucky enough to get this one anyways on my 2nd summon
Really loving this game so far