じつjitsuha
1.

Used to introduce an honest or straightforward statement, often revealing a truth or detail that contrasts with previous information or assumptions.

2.

Indicates the speaker's intention to disclose facts directly, often signaling a shift from generalities to specific truths.

3.

Serves to emphasize that what follows is the unfiltered reality, often implying that there may have been misunderstandings or unspoken truths prior to the statement.

4.

Utilized when the speaker is about to share personal or sensitive information, framing the upcoming statement as genuine and sincere.

Example:

実はそれはただのうわさだったよ。