No, Genki Sushi is not exclusive to Hawaii; it is a large international restaurant chain with a presence in many different regions worldwide. While it maintains a massive and loyal customer following across multiple locations throughout the Hawaiian islands, the brand originated in Japan, where it operates numerous restaurants under various corporate banners. Additionally, Genki Sushi has established extensive franchise networks across various Asian markets, including Singapore, Hong Kong, and other international regions, making it a globally recognized name rather than a localized regional eatery.