Place it just after the correct answer is revealed, then follow it with the Anime Ahh sound for the next reaction, or keep it as the final beat before the Tuturu sound closes a light anime-style edit.
About this sound
This is a 2.6-second smug voice clip from Hakui Koyori, delivered in a short, self-satisfied tone that sounds like she knows she is right. It feels playful and confident, with a teasing edge that makes a small win feel bigger, and it works best as a quick, knowing reaction rather than a long explanation.