Kuromukuro

In the past, a princess inquires about people who live in foreign lands beyond the sea. In the present, a second huge yellow mecha lands on the coast and heads towards the shore accompanied by many small mecha. The Ministry of Defense detect the landing of more hostiles in other countries across the world. Director Shirahane, with Paula and Jiro, go with Dr. Hausen to question Kennosuke, but he manages to escape, taking Yukina, who he now realizes is not the princess. He calls the black cube, which transports them to where the gigantic mecha type object is stored the Black Relic. The cube docks with the Black Relic which Kennosuke activates and uses to smash out of the facility with Yukina on-board. Defense forces attack the yellow mecha with little effect. Director Shirahane orders the defense forces not to attack the 'geoframe' from Kurobe codenamed Giant and controlled by Kennosuke. Kennosuke in the Black Relic attacks the yellow mecha which he calls he calls an Oni and they fight with long glowing swords. Four other Oni arrive on the scene, but with Yukina's assistance as navigator, he defeats them. As he is about to destroy the yellow one, it is taken into the sky on a beam of green light and up to an orbiting space station. (Source: Wikipedia)