Esther and Juno were abandoned together in the same church, and have not separated since then. And they promised each other to compete to find out who would become the next juggler emperor, and therefore Kabra, and became some differences between them. Juno was a genius genius, and he has an amazing ability to master it. While Esther could not use magic, he tried to make up for it through physical training. When it was time for the "Grimoire" at the age of 15, Juno got a stunning book with four persim cards (most people get three sheets of paper) while Ester did not get anything at all. However, when Jono was threatened, Ester went to help him and during his fight to protect Juno, Grimwere got five leaves of Persim, the "Black Clover" anti-magic book, which he did not know he used. ((And now both friends are pursuing the same goal))