The term 'Certain Japanese' can refer to several different people or things. Issei is a term used to refer to the first generation of Japanese immigrants to the United States, who arrived in the late 19th and early 20th centuries. Osakan is a term used to refer to people from Osaka, a major city in Japan. AINU is a term used to refer to an indigenous people of Japan and parts of Russia. SAKE is a type of alcoholic beverage made from fermented rice that is popular in Japan.