The pilot takes off his helmet and scarf. Luca, knowing the words to the anthem, sings. The town raises the Italian flag as the pilot of the plane comes out. The plane makes some loops and lands on the water. She tells him it is one of his greetings. The plane flies high leaving smoke writing the words 'Ciao, Portorosso! I'm Back!!' Luca is puzzled by this and asks Giulia what is happening. The whole town notices the fly-by and cheer. It flies over the town leaving colored smoke in the style of the Italian flag behind. Suddenly, a plane emerges out of the mountains behind Portorosso.

Several days later, as they have some fun, Luca suddenly hears something. They even go out on Alberto's Vespa cruising around town. Over the next couple of days, they have several adventures including a couple of excursions to Isola del Mare, where Alberto lived for several years and underwater visiting Luca's home. He tells her that it may happen someday and that they will put aside the past and look forward to the future. She tells him that they haven't due to something that happened several years ago that caused them to divorce. He asks her if they considered to be married again. She tells him that they have been divorced since she was little. Suddenly, Massimo excuses himself and runs off. Then Giulia mentions that her mother will be coming to Portorosso to meet Alberto and Luca's parents.

They talk about what will be happening this summer such as the Portorosso Cup and the fact that Luca's birthday is coming up.

That night, Luca and his family and friends have dinner at Giulia's place. Luca says that is awesome and that they should go around town on it some time. He also shows him a Vespa that he got through chore money. He added some blankets and placed some lanterns. Alberto tells him that he added some touches to the treehouse. At the house, Luca notices some new things. Alberto tells Luca he missed him and asks him to tell him everything. Luca notices Alberto and they run to each other. The train arrives and slows to a stop at the station, as Alberto cheers. A couple of minutes, Alberto notices something in the distance. Massimo tells him that they will come sooner or later. After a couple of hours, Alberto gets bored, and tells them it might take forever. Meanwhile, at the train station in Portorosso, Alberto, Luca's family, and Giulia's father, Massimo wait for them to arrive. Giulia agrees and tells him that they will make the best of it. He tells her that this summer would be better than the last and it will be amazing to be back with Alberto since he missed him so much. Luca tells her that he had a wonderful time seeing more of the world. Onboard, Luca and Giulia look back at Genoa. The train leaves and heads on its way to Portorosso. She waves goodbye to Luca and Giulia as they board the train. They head to the train station where Giulia's mother, Lisa, kisses her daughter and tells them that she will be visiting Portorosso this summer to meet Luca's friend, Alberto Scorfano (who is her stepson), and Luca's parents hoping to get to know them. Luca Paguro and Giulia are preparing to head back to Portorosso for the summer. Several miles away, in Genoa, school has let out. He tells her that he will get there soon, kisses her, and bids her good night. He looks at a picture of Giulia when she was young. He calculates how far away he is and how many days it's going to take to get there. In the night sky, a plane piloted by Roger, an old American friend of Giulia Marcovaldo is heading back to Portorosso after his last visit five years ago. We begin with Luca and his friends on a machine to 2024 in the 21st century, one year after the events of Luca. And as an old friend from the United States teaches our heroes more about the world and helps them learn new things, they will find out family is important as they try to rescue one. Now it is up to Luca to help Giulia reunite her parents and find out why they divorced. But when Massimo is around, chaos ensues. Giulia's mother is visiting Portorosso to meet Alberto, her stepson, and Luca's parents. It has been a year since the events of Luca, and our underdogs have returned.

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