Rei Hizuki

Lieutenant Rei Hizuki is a quiet and secretive officer in charge of the Sonic Diver program at the Oppama Testing Facility. While Lt. Col. Togo outranks him, Lt. Hizuki's position in the program puts him above Togo. Unbeknown to the others, he is preparing the Sonic Divers to combat WORMs. He is an unsociable man who is not used to showing his true feelings giving him the appearance of a cold man.

He is voiced by Junji Majima.