Future Robo Daltanius

The story takes place in 1995, after an alien army from the Saar cluster, known as the Akron, has conquered Earth. Cities have been destroyed, and survivors live in harsh shanty towns and villages. Kento, a war orphan, and his companions seek refuge in a cave to escape bandits, where they stumble upon the secret base of Dr. Earl, a Helian who fled to Earth after his home planet was conquered by the Akron. Dr. Earl entrusts Kento, a descendant of the Helian royal line, with the Daltanius, a powerful super robot that combines with the intelligent lion robot Beralios to increase its abilities.