An inheritance can turn your life upside down especially when you unexpectedly receive not just an ordinary house, but a large estate with towers. But the joy of Danilo, who was made happy by such a gift, is quickly overshadowed: the uncle who bequeathed him his wonderful home has disappeared without a trace, and a secret is hidden within its walls. Exploring his new home, the boy stumbles upon a bizarre portal that transports him to the amazing city of Leoburg a city of inventors and artists, where airships float in the sky, monorail trains rumble above the rooftops, and steam-powered robots do the housework. Is this just a mirage, or a real parallel world? And is Danilo ready to lose everything for the sake of freedom and justice?