Ren reads an article about kakigori on the internet.

　Kakigori has a long history in Japan. It was first mentioned in Makura no Soshi, or The Pillow Book, written by Sei Shonagon in the Heian Period. It was called kezurihi and was considered an “elegant” treat. It was served in a metal dish and eaten with sweet syrup made from plant vines. Since there were no freezers at the time, they had to put winter ice underground. Some of the ice melted, but the remaining ice could be used for kezurihi. This made shaved ice a luxury, so ordinary people couldn’t afford it. In the Edo Period, people became better at keeping ice, and it became possible to transport ice. But shaved ice was still mainly enjoyed only by the rich.
　In the Meiji Period, however, shaved ice gradually became more common thanks to the invention of the ice-making machine. After World War II, kakigori became a popular summer treat with refrigerators and handy ice-shaving machines in households. Syrups of different colors and tastes also became available. Nowadays, beautiful pictures of elaborate kakigori can be seen on social media.