Nobody expects a one-minute music video to lodge itself in your brain like this. Keiko Nakajima's song about a ghost isn't trying to be cute or clever, it's just precise, the melody hitting exactly where the animation needs it to, the two moving as one thing. You watch it once and understand why people still talk about it decades later.
Yuurei Nanda ze is a single-episode music video made to accompany the song of the same name, performed by Keiko Nakajima. The animated clip appeared as part of Minna no Uta, a program on NHK. The piece is a brief music release, with the animation set to the track.