In 1970s-era Japan, three children, Kazuma Kiryu, Akira Nishikiyama, and his younger sister, Yuko Nishikiyama, are raised together in Shintaro Kazama's Sunflower Orphanage. In the summer of 1980, Yumi Sawamura, a young girl whose parents were accidentally shot and killed during a gang's shootout, j...