Yuru Camp, also known as Laid-Back Camp, is a Japanese manga by Afro that was adapted into an anime series in 2018, following a group of schoolgirls who enjoy relaxed outdoor camping trips. Konnichiwa is a standard Japanese greeting used for hello or good afternoon, so the line fits naturally with the show's warm, easygoing tone. Short anime greetings like this one circulate widely as reaction sounds, because they are instantly recognisable to fans and easy to reuse in edits, memes and short videos.