MARUSAN-AI Co., Ltd. engages in the manufacture and sale of miso (seasoning made from soy beans for soup, and dip), soymilk, and beverages. It operates through the following segments: Miso, Soy Milk Beverages, and Other Food Products. The Miso segment manufactures and sells raw miso, instant miso, and cooking miso. The Soy Milk Beverages segment sells soy milk, soft drink, and water. The Other Food Products segment includes food products that are not in the miso and soy milk category. The company was founded on March 7, 1952 and is headquartered in Okazaki, Japan.