Yashiro's Brother

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Yashiro's brother (also known as The Killer's brother), is the posthumous overarching antagonist of the series ERASED and the older brother of Gaku Yashiro, he only appears in the manga and possibly a cut concept character in the anime and live action. He was one of the main reason for Gaku's villainy.

Biography
Yashiro's brother was abusive towards his brother to the point that he forcibly gets Yashiro to keep guard as he lured a young girl into the shed, and raped her. Yashiro would then manipulate the girl into not telling the truth of what happened to her. Since then, Yashiro's brother would rape a young girl monthly, and Yashiro took a thrill out of manipulating them into getting molested by his older brother. However, when Yashiro wasn't keeping watch over the shed, their mother began to approach the shed; out of desperation, his brother attempted to silence his recent victim, but he accidentally ends up killing her.

Fearing the consequences, Yashiro's brother attempts to pin the murder on Yashiro. Realizing his brother's intentions, Yashiro murders him, and hangs him up with a noose in order to give off the illusion that he had killed himself. Despite being a one-time character, his brother left a lasting effect on his mind. Eventually, Yashiro attempted to lure children to their deaths, but he wasn't successful. When he was to marry a child psychologist, he took advantage of her knowledge on child psychology, and used that to commit several successful murders.

In the final chapters of the manga after Yashiro was arrested, Yashiro's Brother was mentioned by Yashiro as in he admitted the murder of his older brother, finally allowing him to rest in peace despite he was a villain.

Trivia

 * He is the only antagonist to be absent from the anime adaptation of the manga, it's most likely due to the graphic content pertaining to Gaku's back story possibly to keep its TV-14 Rating, another reason why he was cut was possibly to save time. He also didn't appear in the live action adaptations (both 2016 and Netflix version).
 * It's possible that he was a concept character
 * Despite he never appeared on the adaptations (Anime, 2016 live action and Netflix live action), it's assumed that he's a unseen character.
 * Due to the lack of Gaku's Back story, the reason why Gaku motives on becoming a serial killer would be unknown due to his brother not appearing.
 * He is also the only villain to die (since both Akemi and Gaku were brought to justice).
 * If he succeeds in framing Yashiro this would show how evil he would be and its possible he would be become the main antagonist instead of Gaku.
 * Despite being a one time character, he is the overarching antagonist, cause he was responsible for Gaku's villainy, which cause him to kill people.
 * If he never abused Gaku or raped girls,some parts of the series not happen Gaku would never commit the murders or kill Sachiko. Gaku would've been a different person.
 * Chronologically he is the first antagonist.