This is Mizaki Brewery 株式会社三崎屋醸造 Amazake make from Niigata rice with no additives 新潟米無加糖あま酒. Amazake usually contains little or no alcohol and can even be offered to children. This amazake is refrigerated and is prepared by diluting with water and heating. It makes several servings, the number depending on how thick you prefer it. One pack sells for 370 yen.