N・H・Kにようこそ！のプルリンちゃんコスチュームです
日本のオタク間でもマイナーな曲を歌うからびっくりしたな……
Why do you know this song, Ame...

This is a costume of Pururin-chan from Welcome to the NHK!
I was stunned that she'd sing a song that was so little known, even among Japanese otaku...
Why do you know this song, Ame...