The story of the new film is set in Sweetsland, a country next to Jewelland. Ruby and the other Jewelpets are celebrating the birthday of the princess with dancing. However, during the preparations for the birthday party, a mysterious object appears from the skies. In the object is a Sweetspet boy, whose identity is unknown.

First movie of Magical Taruruuto-kun

It is the year 1995. Earth has been conquered by an alien army from the Saar cluster known as the Akron. The cities of Earth have been destroyed, and the remaining survivors live in harsh shanty towns and villages. Kento, a war orphan, hides within a cave along with his companions in order to escape some bandits. In the cave, they find the secret base of Dr. Earl, who was an inhabitant of the planet Helios, a planet conquered by the Akron. Dr. Earl then fled to Earth, bringing with him the greatest achievement in Helian technology: the super robot Daltanius, whose power is increased when combined with the intelligent lion robot, Beralios. Dr. Earl entrusts the fight for Earth to Kenta, who happens to be a descendant from the long disappeared Helian royal line. (Source: Wikipedia)