Managing to distribute all fliers with ~終える


Grammar Explanation

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Cocoa encounters Syaro handing out fliers for her part-time shop. Syaro says she cannot return (to the shop) until she finishes handing out all the fliers.”

シャロ:
全部(ぜんぶ)(くば)()えるまで(かえ)ないわ」

In this sentence, ()える is used because Syaro has to put in effort to complete the action. Rather than “when I finish handing out these fliers”, it has a connotation of “when I manage to finish”.