Yoji and Natsuo

Natsuo Sagan (目奈津生, Sagan Natsuo?)
Voiced by: Mitsuki Saiga
He is the fighter of the male Zero pair. He is one of Nagisa's experiments, and presumably the second generation of Zeros. He first makes an appearance in volume 2, when he and Youji corner Soubi when he's alone. When Soubi wins the battle, Natsuo tells him that he and Youji have no place to return to if they lose a battle. Soubi offers to let them live at his apartment, and Natsuo warily accepts. Natsuo seems to care for Soubi and Ritsuka, and in turn, does nothing to harm them.
In one of the Zero-sum chapters, they are told to defeat Seimei. But because of the other's unusual power with words, the Zero team was rendered practically useless.


Youji Sagan (目瑤二, Sagan Yōji?)
Voiced by: Hiroyuki Yoshino
He is the sacrifice of the male Zero pair. He is the more cruel and brutal of the two; however, they are both rather blunt and cold towards others. A good example of this is in volume 5, when Ritsuka rushes home after curfew, and Soubi remarks that Ritsuka will probably get a "beating". Natsuo and Yoji are both amused by this, and say, "A mother abusing her child! That's the best!" while grinning happily. Like Natsuo, Youji seems to care for Soubi and Ritsuka, and in turn, does nothing to harm them.
Nagisa is unashamedly biased towards Youji, often ignoring Natsuo. According to Youji, this is because he bears a significant resemblance to Nagisa's younger sister.
In one of the Zero-sum chapters, they are told to defeat Seimei. But because of the other's unusual power with words, the Zero team was rendered practically useless.

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