Lotte gets a little sister named Roosi. Two scientists Karl and Viktor come to Gadgetville, they are taking part in a big folk song collecting competition. Whoever succeeds in recording the folk song of the world’s oldest animal species, wins the competition’s grand prize. Lotte and Roosi decide to help the scientists. Exciting and unexpected adventures await the sisters.

In 2058, 10 years after World War IV, Jane returns home from college after graduation to meet the love of her teenage heart. However, the promising summer joy is endangered by the regime and the relationship between people.