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Shin did not immediately leave the Mayor's Manor as he wanted for the people that Shiella had arranged for the protection of Ribbit. This additional security would put Shin more at ease, making him focus more on other tasks that he had in hand.
He only left after introducing the group that Shiella had sent to Ribbit and the rest of the guards patrolling around the Mayor's Manor.
After making sure that everything was fine, Shin quickly headed to the Holy City and looked for Berlin's Workshop, planning to consult the Saint Blacksmith about the dimensional key that Kentas was talking about.
Shin was preparing himself to get rejected. Or at the very least, he had to be prepared to negotiate with Berlin. He knew that Saint Blacksmith only agreed to reforge his sword, the [Yamato], because of the recommendation of the Dwarf King that he met in the beginner's village, Orn. Given this, he had to offer something that would make Berlin grant his request.