尾崎 孝治

A mysterious man Nao first meets at the school evacuation zone, he later tries to kill Nao when the school is assailed by the Disaster Zone monsters but fails. Nao attempts to find him in the hopes of reasoning with him and using his powers to return to the Disaster Zone to save the survivors trapped within.

Ozaki Kouji is possibly an alias for this ex-policeman turned mercenary working together with Sabikawa Shinri. He acquires Yuuri's trust when he is saved from the Conglomerate's confinement and as a consequence is infected with the Baroque virus. Yuuri is initially unaware that "Teraoka" is the same person Nao is looking for when they are reunited.

The greatsword Ozaki wields generates gravitational rifts which he and others can pass through. The rifts allow him to traverse space and time plus he is able to hide in them when spying on a target. If required, he can use the rift as a prison to remove targets from existence. The weapon itself is capable of dismembering the monsters in the Disaster Zone with little difficulty.

A former detective in Tokyo who was dismissed for corruption, he survives as a mercenary until he encounters Sabikawa Shinri. He becomes infatuated with her and is willing to go along with her scheme in return for enjoying time spent with her. Cynical and nihilistic, he is nevertheless extremely experienced in combat situations and has full mastery of his Baroque powers.

He dies in all three routes.