こそ
(Koso)
Used to emphasize a specific noun, often to distinguish it from others.
Connection rules
- +Noun + こそ
Examples
1.
今年こそ、日本語能力試験に合格したいです。

Kotoshi koso, nihongo nouryoku shiken ni goukaku shi tai desu.
This year for sure, I want to pass the JLPT.
「New Year's resolution」
2.
こちらこそ、どうぞよろしくお願いします。

Kochira koso, douzo yoroshiku onegai shi masu.
It is I who should say that, please treat me well.
「First meeting」