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Ruby Kurosawa's (From Love Live!! Sunshine) catchphrase.
It's supposed to be a joke on words because ganbaru (roughly) means 'Do your best' in Japanese and her name is 'Ruby' so it becomes 'ganbaruby' which means 'Do your rubesty'!
Love Live fan #1: I have two tests coming up..
Love Live fan #2: Don't worry! Ganbaruby!
via giphy
by vivian is the BEST November 12, 2016
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