にほんいち 日本一 Common word LinksSentence search for 日本一Sentence search for にほんいちSentence search for にっぽんいちKanji details for 日, 本 and 一Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. Japan's best; number one in JapanOther forms日本一 【にっぽんいち】 Discussions Log in to talk about this word.