A mermaid on a bicycle through an ordinary town sounds like a children's song, and it is one, but the animation trusts you to sit with small moments instead of explaining them. The music carries everything, it's not background, it's the reason the images exist at all. By the end you've watched something that feels less like a story and more like someone humming a memory they can't quite name.
A mermaid travels around town with a companion that can turn into a bicycle. The short piece is a music video made for a song by the duo Hana*Hana, and it aired on NHK as part of the program Minna no Uta. It consists of a single episode, built around the playful image of a mermaid out riding through the streets.