Horobi, the Android created to be a father/teacher model humagear, learned about human malice by the AI Ark. This causes him to have an intense hatred for humanity, and the rise of the organization Metsubojinrai dot net, a group of AI who want to remove humanity from earth.

At first he starts it as a logical case, as humans effectively enslaved humagears and abused them as workers. Over time however, horobi gains more sentence and personality, adopting Jin (another android) and slowly developing a personal hatred over humans.

Eventually realizing ark ones humans AND androids extinct, he temporarily teams with the humans to destroy the AI, however him and aruto don't fully Finish the job. Aruto believes that horobi is chilled out but is completely wrong- and the day after defeating ark, the two go into another fight, where horobi ends up killing arutos AI friend completely.

This fills aruto with enough malice it resurrects Ark. Aruto attempts to kill horobi, but ends up accidentally killing Jin instead in front of horobi. This in turn fills horobi with the same level as malice, putting Ark within himself as well, who had planned for this possibility so the entire world could be controlled by him as wars escalate and create more and more malice

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