Place this clip right after the questionable claim in your edit, then follow it with Ceeday Huh for a second reaction before cutting to Oh My God Wow when the twist is revealed.
About this sound
This is a very short voice clip, just under a second long, of a young Japanese girl drawing out a rising 'Eee' in a doubtful, questioning tone. It feels light and playful, with a hint of disbelief that makes an odd claim sound even stranger. The sound works as a quick, expressive reaction rather than a line of dialogue.