Nobody talks about this one. A single NHK music video from decades ago captures something most anime with ten times the budget miss: the quiet urgency of a mother's day, told through a children's choir that sounds like it actually means what it's singing. The animation is spare, even simple, but it doesn't need spectacle. What remains is the song itself, and the specific ache of watching someone you love disappear into the machinery of staying alive. Lost media that deserved to stay found.

Kaa-san wa Isogashii is a one-episode music piece built around a song of the same name, sung by Yoshiko Mari with the Gamagori Jidou Gasshoudan. The video was shown on NHK as part of its Minna no Uta program. No known copy survives today, and the piece is regarded as lost media.