In order for the fermentation to occur, the sake rice malt needs to be added to the melted rice (in which the amount of malt must be more than 3% of the amount of rice), so that it is broken down to glucose which can be consumed by yeast.
発酵を起こすには、融かした米に麹を投入して（麹歩合が"原料米の３%以上"必要)酵母が消費できるグルコースに分解する必要がある。