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„The newspaper additionally reported on Tuesday that Watanabe told police that dropped out of an anime vocational school when he was around 20 years old. Watanabe said, "My goal was to become a creator of manga, anime, or games, but after about a year I dropped out." In a threat letter Mainichi Shimbun received, the sender had said, "If I were to live my life over again, I would want to become a manga creator with a serialization in [Weekly Shonen Jump]."
Police searched Watanabe's apartment on Monday and seized toilet cleaner and a scrap of paper on it with the handwritten words "creating hydrogen sulfide." Police also found and seized copies of the Kuroko's Basketball manga.
Mainichi reports that Watanabe sent around 400 letters from 16 post offices in nine prefectures, and police have not detected fingerprints on any of the letters. Mainichi also reports that, according to police, Watanabe identified himself as two different perpetrators, one who spoke standard Japanese and one who spoke with a Kansai accent (the letter sent to Tsukuru editor in chief Hiroyuki Shinoda was written in a Kansai accent).
Watanabe had written in the letters and online that he was acquainted with original author Tadatoshi Fujimaki, but the suspect is reportedly not acquainted with him. Watanabe also posted a message in October 2012 claiming responsibility for the original threat letter to Sophia University from an Internet cafe in Chiba prefecture, and he posted other online messages through overseas servers. Watanabe had also written in his letters that he lived in Chiba City when he was acquainted with Fujimaki, and that he lived in Saitama when he first sent that threatening letter to Sophia University last year. He also wrote he was "currently" living in western Tokyo, although his apartment, which he has been living in for about a year, is in Osaka.“
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