Chocolate melts in your mouth, spreading deliciousness. The key to its secret lies in the mysterious properties of cacao. However, due to these properties, there was a long history before chocolate was created. In fact, it took nearly ten thousand years from when humans first encountered cacao in the tropics to when chocolate was finally made in cold Europe. There is no other food that has had its method of consumption change so drastically over such a long period. The transformation of cacao beans into chocolate involves a deep interplay of nature and human activities. Tropical microorganisms and animals, the ingenuity and effort of people who used cacao oil to create delicious chocolate. It's a story filled with science and history. Why not savor the profound world of chocolate while you eat it? In addition to the added illustrations and newly drawn cover art, pay attention to the playful book design, which resembles chocolate packaging. The signature is said to have a different illustration added to each title★ The item is unopened. It's very cute and one-of-a-kind★ This signed book was a limited-edition sale at Daikanyama TSUTAYA from December 6th to December 25th. I was able to purchase it on the 7th at Daikanyama TSUTAYA just before it sold out★ It's very rare and valuable because it sold out quickly★