Wanwan Train Doko e Iku?

After the 7G incident twisted the world in impossible ways, Shizuru, Nadeshiko, Reimi, and Akira face a particularly strange problem: they have somehow become a small dog-like train. Learning to move, communicate, and put up with one another in their new form turns into a string of playful mishaps, where staying together may be harder than simply figuring out what they have become.