This clip is identified as Ayaya “oh my god” from Kiniro Mosaic, a school comedy anime that became popular with online anime meme communities. Short reaction lines like this spread because they are easy to trim into edits, compilations, and Discord-style joke videos. Its appeal comes from the contrast between the soft, cute anime delivery and the exaggerated feeling of surprise. It is still used when creators want a fast anime reaction sound that feels expressive without being too long or too aggressive.