When Hitomi was sixteen years old, he was inaugurated as Code:Breaker 06, and due to his excellence at his job, he was considered a promotion. Heike was revealed as his senior at that time. Four years later, Hitomi's unnamed partner, Code:Breaker 05 at the time, was killed during an operation, and it is shown that his watch stopped working the moment he died. Heike promoted Hitomi as the new Code:Breaker 05, but Hitomi was greatly troubled by his partner's death. Six years later, being assigned to take out a terrorist coupe of supernaturals, Hitomi, as Code:Breaker 03, is distraught when the rest of his group except Hitomi died during the mission, and only the leader rogue supernatural managed to escape. Hitomi, explaining to Heike that Code:Breaker 06 at that time was killed by her own powers, requested him to investigate upon the matter. With Hitomi promoted to Code:Breaker 01, he was tasked to train the recruited Code:Breakers (Yuki, Toki, Rui and Ogami), initiating them as Code:Breakers after their individual training sessions. However, Hitomi took concern for Ogami's primary focus of eliminating evil without thought of any consequences. During a rescue mission with Ogami and Toki, Hitomi is seen carrying a child, which was the real objective of the rescue mission. Hitomi later told Ogami that their purpose should be protecting the powerless and not simply killing the wicked. On another job with the other Code:Breakers, Hitomi finally killed the leader rogue supernatural to avenge the deaths of his former comrades. Heike later informed Hitomi that the Code:Breakers could die if they overuse their own powers numerous times, which was something Eden had kept them from knowing. Although Hitomi failed to reveal this to Ogami, he silently vowed to get revenge on Eden. In the present, Hitomi announces to the public on Sky Tower that he will kill the Prime Minister and 50,000 other civilians across Japan.