Place it at the end of a teasing setup, just before the reveal that never comes, then follow it with Awkward Moment for the reaction shot. For a bigger reaction, put Anime Ahh after it to sell the group's surprise at being left hanging.
關於此聲音
This is a 1.5-second voice clip of Aoyama saying, in a coy, teasing tone, that it is a secret. The delivery is light and deliberately evasive, turning a simple refusal into a playful little mystery. It feels cheeky and secretive, like a character dodging a question with a smile rather than giving a straight answer.