Yuko (錦山 優子, Nishikiyama Yūko) is Akira Nishikiyama's younger sister. She was, alongside her brother, Kazuma Kiryu, and Yumi Sawamura, raised at Shintaro Kazama's Sunflower Orphanage. She suffered from an unnamed illness involving her heart, which had her going to the hospital periodically.

Yakuza/Yakuza Kiwami Edit

In 1995, Yakuza, anticipating her final surgery, her reliance on her elder brother is the reason Kiryu decides to take the fall for Sohei Dojima's murder.

However, she dies shortly after in 1996. Her death, alongside Yumi's disappearance and Akira's feelings of inferiority, spiral her brother's descent into darkness.