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He is the biological father of Yamato Kisaragi, adoptive father of Mikako Kurokawa, and was the former head of the Kisaragi Foundation prior to his death. Hanzo is first introduced in Chapter 3 when his graduation album is discovered by Tsurugi Kinjo and Yuki Maeda in the science lab. A photo of him posing with Yamato and Mikako as children is found by Yuki later in Chapter 6. During his youth, he attended Hope's Peak Academy as a part of the 58th class as the Ultimate Inventor. Hanzo developed a terminal illness in his youth that went unnoticed during his time at Hope's Peak Academy and grew worse in adulthood.