There are two ways to access the Collector's Boutique's special shop on the north end early. Both of these require you to have the first game, "The Denpa Men: They Came By Wave".
Unlockable | How to unlock
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100% Item Completion in first game | High-end shop in Collector's Boutique.
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Beat True King in the first game | High-end shop in Collector's Boutique.
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