Place it right after the promise is made, before the reaction shot, so the commitment sets up the payoff. Follow it with a Bruh sound for disbelief, then an Emotional Damage sound when the promise falls apart.
About this sound
This is a short 3.4-second Japanese voice clip built around the name Naoya and a phrase about holding someone to their word. The delivery is quick and pointed, with a teasing edge that makes it feel like a playful call-out rather than a serious demand. It lands as funny and slightly awkward, the kind of line that works when a promise is suddenly on the record.