Kuromukuro

60 years ago the cube and the giant are discovered and their management is assigned to the United Nations. Examination of the destroyed alien Cactus units show no sign of a human pilot. It is confirmed that six large units landed on earth. Kennosuke takes the Black Relic to the Azumi Castle which is now uninhabited. While trying to adjust to the modern world, he is captured by UN forces and the Black Relic is immobilized. He escaped custody again, but Sophie Noelle tackles him and he is subdued by UN forces activating a collar around his neck. Osho Yakushi from the nearby temple talks to Kennosuke and obtains information that places him in the Sengoku period 450 years ago when he was a retainer to the Washiba Clan. Kennosuke uses a diversion by Koharu to escape again, taking her into the mountains, but they are attacked by a Cactus unit and Koharu is captured. Kennosuke returns to the UN facility and calls the black cube, takes Yukina on-board and goes in pursuit. He catches the Cactus unit but cannot defeat it alone as his sword breaks. Fortunately two of the single-seater Dwarf units arrive, destroy the Cactus unit and rescue Koharu. On seeing a huge rock cut in two during a battle in the past, Kennosuke finally accepts he is now in the future. (Source: Wikipedia)