If we understand nihonshumai (rice for sake) as raw material for sake, other than kojimai (rice for koji) and shubomai (rice for shubo), there is kakemai that is added during the preparation for unrefined sake.
日本酒の原料として日本酒米をとらえるならば、麹米、酒母米のほかに、日本酒醪を仕込むときに加える掛け米がある。