Calpis Soda is a popular Japanese soft drink that can be found in Tokyo. It is a carbonated beverage made with Calpis, a milky and slightly acidic drink made from fermented milk. Calpis Soda has a unique and refreshing taste, with a hint of citrus flavor. It is often served over ice and enjoyed as a cooling drink during the hot summer months. Calpis Soda can be found in convenience stores, supermarkets, and vending machines throughout Tokyo.