The sound comes from Haikyuu!! To the Top Part 2, the second half of the anime's fourth season, which follows Karasuno's national tournament run and introduces the Inarizaki twins Atsumu and Osamu Miya as formidable opponents. In the match, Osamu's unexpected service ace surprises even his brother, and Atsumu's loud reaction turned the exchange into a favourite fan moment. Shared in short edits and compilations, it endures because it captures both the intensity of high-level volleyball and the twins' playful, competitive bond.