A CM themed around the light novel Nijuuseiki Denki Mokuroku.

In a certain world bubble, the conflict between the armed dolls and the dead soldiers is never ending. With the conflict between the two escalating, the stability of the world bubble is gradually decreasing. To save the world from collapse, human beings set up a special organization to manage and control the dolls. In order to cover up the dark truth, human specially gave the organization a very cute name: "Renou Xueyuan" - "Doll School". —Ahaha, just kidding! How could it possibly be anything like that?

Follow the adventures of Mao, a Japanese teenager and aspiring runner, as she travels back to ancient Greece to learn about the Olympic Games.