Happo Nihon-shu (sparkling Japanese sake) is sparkling, that is, carbon-dioxide-containing Japanese sake which has attracted attention in recent years.
発泡日本酒（はっぽうにほんしゅ）とは、近年注目されてきた発泡性のある、すなわち炭酸ガスを含んでいる日本酒のこと。