Put it at the start of a birthday montage, right after Click Nice, then follow it with Okay Let's Go to move the edit into the party, so it opens the celebration before the dancing and cake clips take over.
About this sound
This is a short clip of Koyuki giving a bright, mischievous Nihahahah laugh, lasting just under two seconds. The quick, high-spirited giggle feels cheeky and playful, like a character bursting with excitement at a birthday surprise. It lands as a light, teasing burst of joy that lifts a dull moment instantly.