|Japanese name:||榊 涼子|
Ryoko was born to the Sakaki family which owns a well-known Kōji and fermented good shop. Ryōko eventually applied and was accepted into the middle school section of Tōtsuki Culinary Academy. Later she applied and was granted a room in Polar Star Dormitory. She became friends with her fellow 92nd Tōtsuki Generation residents Yūki Yoshino and Megumi Tadokoro and the trio would sometimes practice cooking together. Eventually, she completed middle school and entered into the high school section of Tōtsuki Academy.