Place it at the end of a betrayal or failed bet scene in your edit, after Sudden Suspense has raised the stakes, then follow it with Damn to close the moment cleanly.
このサウンドについて
This is a short spoken threat lasting about three and a half seconds, with a low, deliberate voice delivering the line 'you will pay' as a cold warning. It feels menacing and tense, turning a simple promise into a moment of payback and dread. The clipped delivery makes it land like a final word before the consequences arrive, sharp enough to unsettle a listener instantly.