Arigatou is a standard Japanese expression of thanks used in everyday speech, anime dialogue and games, and short isolated clips of it have circulated on soundboards as reaction audio for years. The mnm version is valued for its brief, cute delivery rather than a specific scene, so creators reuse it across streams, edits and chats whenever a polite moment needs a lighter tone. It sits alongside other borrowed Japanese voice memes like Ara Ara, which share the same appeal of being instantly understood from tone alone, even outside their original context.