Last Topic: 3:11:35am, 06/15/2020
Last Post: 5:37:26am, 07/18/2017
I've heard it that it was meant Zenkai. Others just believe that it is the last series Toriyama planned, so Z would be a random addition as the last letter in the alphabet. Last Series-Last Letter.
In Romaji, it's Ze-tto. Which means nothing.
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Flow like the unpredictable waters of the ocean.