Kyoukai Senki

In 2061, Japan is under the control of four global economic blocs, with its population living under harsh conditions. AMAIM, humanoid mobile weapons operated by each bloc, patrol the region. Amou Shiiba, a boy fascinated by machines, encounters an AI named Gai, which leads him to join the struggle for Japan's liberation. He pilots an AMAIM unit called Kenbu, which he constructed himself.