Originally streamed on the official Youtube and NicoNico channels and later included on BD/DVD Vol.5.

Three weeks after the incident that left Captain Napolipolita's ship balancing on top of Graviton City, A-Ko and the gang go on summer vacation. While A-Ko ponders losing some weight and B-Ko devises another plan to defeat her redheaded rival to win C-Ko, Napolipolita and Spy-D experience severe homesickness - begging for a way to return to their home planet. Meanwhile, Hikari Daitokuji - B-Ko's father and the CEO of the Daitokuji Financial Group - arms the local military with new mecha to attack Napolipolita's ship and obtain its advanced technology.

Nanocore is a science fiction Chinese cartoon in 3D. The stage of the story is established on a fictional planet Birthigin. In this young planet, humanity will never stop longing for a bright future despite reason and fear. In revolutions and evolutions, humanity keeps challenging the Creator, and which eventually induces contractions intensified. People choose to wake up and struggle for their own ideals. They end the peace and angers sweep the whole planet, resulting in outbreak of the crisis known as Purple Fog. In time of humans facing their odds of survival, the plan N.S.P led by the elite keeps frustrating until NanoCore's involving. It brings the plan his birth. As the existence, that the elite thinks should lead the development of human weapons, however, he breaks shackles of fate, and arrives at a land where faith no longer exists. He learns to make choices and grows up with them, and the dim future of Birthigin thus begins to change. (Source: Nanocore Tumblr)

Yurume, an 18-year-old "ronin" and recent high school graduate, has high hopes of being accepted and attending Tokyo University. She moves into an apartment complex, the Maison du Wish, located on the outskirts of Tokyo where other ronins living there are studying for upcoming college acceptance exams.