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Emine is a Dokeshi, a childhood friend of Shotaro, and eventually an enemy to both Shotaro's group and Fear Factory. He leads the Observers, a part of the Masked Assembly. His daily condition as a Dokeshi is to perform one bad deed.
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Emine and Shotaro were orphans and best friends. As children, they would imitate their favorite superhero, Charisma Justice, and befriend stray pets and animals in their neighborhood. While the two were frequently the object of scorn from neighbors for being orphans, the two vowed to be each other's support. Emine thinks the two of them became invincible, not just an imaginary power but an actual one that emerged from their very hearts. 
One day, Shotaro had found some bullies had killed a dog, a cat, and a bird that he and Emine had befriended for so long. The bullies, wielding butcher knives and baseball bats, explain that they were tired of how creepy it was for Shotaro to hang around dirty stray animals.
Furious, Shotaro roars and runs at the bullies. The knife-wielding bully stands in his path--then stabs his knife through Shotaro's chest. Emine screams in fear as Shotaro coughs up blood. Before Emine can do anything, he is knocked with a baseball bat by another bully. Although injured, Emine still crawls to his dying friend, who wheezes and coughs. He also remembers how he was beaten before by men and women who mocked him and Shotaro as filthy orphans whose lives are worthless.
As Emine remembers it, he and Shotaro faced all violence together, gaining a trust in each other through those struggles, "an invincible friendship." As he laid dying, Shotaro looked to his dead friends: the dog, the cat, the bird. He thought how if he had their abilities--the dog's fangs, the cat's swiftness, the bird's flight--then he could protect Emine. Meanwhile, as he laid injured, Emine looked to Shotaro. He thought how if he had power, then he could heal Shotaro. Remembering, Emine concludes that "no two Dokeshi [were] more ironic than us." At that moment, both Shotaro and Emine screamed, with Emine's right eye darkening from blood, and a tear-shaped mark appearing on under his left eye. According to Emine, at that moment their strong feelings for each other, to be together, allowed him and Shotaro to become Dokeshi.
Separating from Shotaro
Shotaro learned he was a Dokeshi whose powers depended on performing good deeds daily. Unknown to him, Emine had also become a Dokeshi, whose ability depended on performing bad deeds daily. Emine feared these conditions would keep them apart, and if they fail to meet these conditions, they will lose something precious. Emine thinks what will be lost is their friendship. And he realizes the two of them cannot walk the same path. The two grew more distance. In that time, Emine was bullied until finally he lashed out, killing his antagonists. The duo were then separated.
- Emine's name alludes to the United States rapper Eminem.
- Regarding Volume 4, Atsushi Ōkubo writes that Emine's cheek has a red tear mark, one representative of blood. To learn what color is blood, Okubo claims he cut his thumb with a box cutter. He claims he intended to paint the tear mark with his own blood, but he cut closed fast and did not provide enough blood. He claims he kept running the box cutter over the wound until he started to enjoy it. He concludes that this fact demonstrates that making a manga requires blood and tears.