An unsung tragic hero of Kamiyama School's past. He is Eru Chitanda's uncle, who went missing while traveling, and is presumed dead. Forced to be the scapegoat for a school protest, he took on the full burden and was expelled. He was the president of the Classic Literature Club and the writer for the anthology "Hyouka". The title means "frozen treat" in Japanese, but actually refers to the English words "ice cream": it is a pun on "I scream", thus revealing Jun's silent anguish. He is thought to be lost in India and is later declared legally dead by the authorities for being missing for so many years.