こそ (rōmaji koso)

  1. Emphatic particle used for emphasis. There is no direct translation, but it is roughly analogous to "precisely".
    今日 (きょう)こそ ()るぞ!
    Kyō koso, yaru zo!
    Today is when I'm going to do it!
     (きみ) ()きだからこそこれほど頑張 (がんば)っているんだよ。
    Kimi ga suki dakara koso kore hodo ganbatte irunda yo.
    It's precisely because I like you [because of my fondness for you] that I'm working this hard.