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Takao Kawafuji (川藤 鷹生)Seishuu's friend who takes care of his calligraphy and other needs. He later on starts living at the Goto Islands together with Seishuu and Kousuke.
In middle school, he told Handa that the other kids hated him, leading to Handa's paranoia and introversion in high school and afterwards.
(Source: Barakamon Wiki, edited)