Born in Minato City, Tokyo in 1927, Ishibashi was the son of music composer Randô Fukuda and grandson of Meiji era painter , he grew up in area until he was three years old. His mother Chiyo was born as the fifth of eight siblings to the wealthy Ishibashi family. When Etaro was three years old, his father raped actress Hiroko Kawasaki at a place where he went to wrote a film score. Rando takes responsibility and remarries Kawasaki after separating from Etaro's mother. 