Place it just after the reveal beat in an anime edit, then follow it with Anime Ahh to extend the reaction, or lead into it with Mayuri Tuturu before the surprise lands.
關於此聲音
This is a short vocal reaction from Towa lasting about a second and a half, built around a voice exclaiming wow omg. It feels instantly surprised and delighted, like a genuine gasp at something cute or unexpected, and it carries a playful, lighthearted energy that makes a reveal feel bigger.