Which traditional cultural practice directly inspired the development of KitKat's special flavors in Japan that led to a retail revolution and over 300 regional varieties?

Cultural traditions have significantly influenced product design, marketing, and retail strategies worldwide. Many successful brands have incorporated cultural heritage elements to create authentic connections with consumers. This trivia question tests your knowledge about how traditional cultural symbols have been integrated into modern product innovation and branding. Can you identify the correct cultural tradition behind this famous retail innovation?

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Omamori (Japanese lucky charms) - as KitKats were given as good luck gifts for students taking exams
Origami (paper folding) - as KitKats were designed to be folded in special ways to reveal hidden messages
Hanami (flower viewing festivals) - as KitKats were first released with seasonal cherry blossom flavoring
Shodo (Japanese calligraphy) - as KitKats featured artistic packaging with brush-written characters