Put it at the very start of a Japan or anime edit, then follow it with the Oh My God Wow reaction before a Kids Cheering burst closes the opening, so the sequence moves from greeting to surprise to a bigger crowd moment.
About this sound
This is a short 2.6-second voice clip of someone stretching out a cheerful 'Yooooo Japan' in a high, excited tone, with the word Japan landing as the punch of the line. It feels playful, loud and instantly celebratory, like a greeting shouted across a room to get everyone's attention. It works as a quick burst of enthusiasm rather than a calm announcement.