Isamu Hiroshima(勇広島 Hiroshima Isamu) is the father of Akira Hiroshima, and as well as his son, the only live person who knows the truth about the Red Mask Massacre. As a result, Isamu lives in spite of Akira, and prefers not to consider him his son, despite Akira's high position. Isamu is a village elder of Iwagakure