Saeko Tanaka

Height: 155.2 cm / Weight: 48.8 kg / Birthday: May 5 / Favorite Food: Homerun Bar / Current Concern: No one understands how cool my younger brother is! / Age: 21 years old ("Small Giant" classmate)

A university student and former member of the Karasuno High School Old Girls' group. She is the older sister of Ryunosuke Tanaka.

Like her younger brother Ryunosuke, she is a caring "big sister" type of woman. In college, she belongs to the Wadaiko (Japanese drum) team, and she is active in festivals. She was unable to leave for the joint summer training camp before summer vacation due to supplemental lessons for a failing subject, but at Ryunosuke's request, she drove Shouyou Hinata and Tobio Kageyama to the training camp (Fukurodani Academy High School). She is well-loved by the members of the Karasuno Volleyball Club, who call her "big sis," and she is friendly to many acquaintances by calling them by their first names.

Although she was a classmate of the "Small Giant," she doesn't have a clear acquaintance with him. While driving Hinata and Kageyama to the training camp, she spoke of her impression of the Small Giant, saying, "He has an absolute pride and confidence in being the ace, something that seems to radiate from his whole body." She has watched the volleyball team's games several times, and although she is an amateur in volleyball, she understands each team member's role and positioning through the commentary of Takanoue and Shimada. During the final match of the Spring High preliminaries, she rallied the disheartened Karasuno supporters in the fifth set (9-12).

After the victory in the final match of the Spring High preliminaries, she single-handedly supported a fainting Yachi. She is also good at handling alcohol, having consumed a considerable amount on the night she delivered Hinata and Kageyama to their training camp, along with Coach Nekomata (Nekoma) and Coach Takeda.

During the Spring High nationals, she led her Wadaiko team to Tokyo for the second round match against Inarizaki and motivated the Karasuno members with their "Karasuno Drums" performance against the Inarizaki Band. As of 2018, she is employed at a motorcycle shop and also serves as the representative of the Wadaiko group "Ugo."