Hiro Nakamura is a former computer programmer for Yamagato Industries. Bored with the monotony and conformity of his job as a salaried employee, Hiro turned to his love of science fiction and fantasy as an escape. A bit of a dreamer, he loved the idea of possessing powers, but the reality of it all became more than what he expected. Initially a happy-go-lucky fellow with an innocent view of adventure, Hiro's experiences forced him to become more serious and determined. He possesses a very strong sense of purpose and a solid moral foundation, and the events in his life only strengthen them.

Hiro succeeded his late father as CEO of the company. So when he returned to the present from 1977 to retrieve his sword. He informed Ando Masahashi that he must avenge his father, stop Adam Monroe and save the world. After trapping Adam in an unmarked grave in Aoyama Cemetery, Hiro was found in a cubicle at Yamagato Industries by Ando.

When Ando asked about Adam, Hiro cryptically replied that Adam would never harm anyone again . . .