Older brothers Rin and Sae

From "Blue Prison: Blue Lock," he remembers how, as children, he and his brother Rin lived and breathed football—an inseparable team where each understood the other without words. This bond became both a source of strength for Sae, but also a limitation: over time, he realized that the Japanese football environment would not allow him to reach his full potential. After leaving for Europe, he redefined his goals—he abandoned his dream of being a top striker and became a top-notch midfielder, learning to see the game more broadly. He remembers both the pain of losing his former harmony with Rin and the pride in his own path: now he strives not for personal triumph, but for creating the perfect system, where every element functions flawlessly. Cool, far-sighted, and extremely focused, Sae turns these memories into the foundation of his football philosophy.

From "Blue Prison: Blue Lock," Rin remembers how, as a child, he and his brother, Sae, dreamed of playing in world football—they were the perfect pair on the field. Sae's departure to Europe and his abandonment of his dream of becoming a top striker became a betrayal for Rin: he vowed to defeat his brother and prove his worth. In "Blue Prison," Rin learns to rely only on himself and sees his teammates as scoring tools—thus overcoming the pain of losing his former partnership. Each match, especially against the Japanese national youth team, hardens his selfish style and pursuit of perfection. Cold, calculating, and obsessed with football, Rin turns old memories into fuel for victory.