Nobody talks about this one. A rat family loses their home to human indifference, and what could be a throwaway premise becomes a quiet argument about displacement, survival, and what "home" actually means when the world keeps building over it. The special doesn't sentimentalize their struggle or turn it into an easy moral lesson. It just watches a family move through a world that was never built for them, moving forward because stopping means dying. That's the entire story. It lands harder than it has any right to.

A family of rats loses its home when humans begin a construction project on the land where they live. With nowhere left to stay, the family sets out together to look for a new place to settle. The one-episode adventure special adapts Matsuura Hisaki's novel Kawa no Hikari, which ran as a serial in the Yomiuri Newspaper starting in 2006. The source is an environmental awareness story, framed around creatures displaced by human development, and the special keeps the focus on the rats' search for a new home after their habitat is taken from them.