29 years after the events of Iron Sky, the former Nazi Moonbase has become the last refuge of mankind. Earth was devastated by a nuclear war, but buried deep under the wasteland lies a power that could save the last of humanity - or destroy it once and for all. An old enemy leads our heroes on an adventure into the Hollow Earth. To save humanity, they must battle the Vril, an ancient shapeshifting reptilian race, and their army of dinosaurs.

Nia and Nika, accompanied by their parents, plan a New Year's trip, but their mischievous behavior leads to punishment. Instead of following their parents, they have to spend New Year's at Grandpa's house, who discover a magical locket capable of granting wishes. Opting for a private celebration, the siblings find themselves targeted by robbers hired by a collector eager to obtain the medallion. Now, the children must confront the thieves on their own

After 20 years, by a strange twist of fate, the paths of Maro and Mitua, now Dimitri, cross again. Maro will try everything to get her Mitou back, but the past becomes impossible to get back.

The one joy in the lives of a mother and daughter comes from the regular letters sent to them from Paris from the family's adored son, Otar. When the daughter finds out that Otar has died suddenly, she tries to conceal the truth from her mother, changing the course of their lives forever.