Gen Nakaoka is the protagonist of the manga and anime Barefoot Gen. He leads his mother Kimie and his adoptive younger brother Ryuta in the aftermath of the atomic attack on Hiroshima in World War 2, having lost his father Daikichi, older sister Eiko and younger brother Shinji to the firestorm. He gains a new infant sister named Tomoko immediately after the firestorm only for her to perish from malnutrition a couple of weeks later. He is only 6 years of age in the 1983 Anime film which is set at the time of the nuclear strike in August 1945 so can be no older than 9 or 10 in the 1986 sequel which is set 3 years later. He is the fictional alter-ego of the late Keiji Nakazawa who survived the nuclear strike on Hiroshima at the age of 6.
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