Kisou Shinden: Gen-Kaiser

A scientist named Zen Shiratori was investigating the ruins of an ancient Mayan temple, convinced that the proof of the existence of a parallel world lies there. He found a strange glowing orb, which was later accidentally discover by his fourteen-year-old son Gen, who was rummaging through Dad's collection. As a result, Gen was indeed teleported into a parallel world. There, he meets a young girl...