Tōya Saeki works in Sunlight Beverage’s planning department and competes on the company’s corporate badminton team as Koki Takeda’s doubles partner. He shares a home with his older brother Sota Saeki, who is four years his senior, to reduce living costs. This arrangement reflects their close yet sometimes strained sibling dynamic, especially after they become badminton doubles partners.

As a former high school teammate of Mikoto Shiratori, Tōya understands Mikoto’s playing style and foresight abilities—knowledge that benefits the team when Mikoto joins Sunlight Beverage. In matches, Tōya leverages natural instantaneous power and intuition, reinforcing his active team presence.

During a badminton team reshuffle, Tōya partners with Sota. Though enthusiastic, their conflicting viewpoints and Sota’s hesitation spark friction, nearly ending their doubles arrangement. Simultaneously, Tōya navigates unspecified professional difficulties in his planning role.

His name "Tōya" merges "orange" (橙) and "to be" (也), while "Saeki" combines "help" (佐) and "count/earl/uncle" (伯). He has brown hair, brown eyes, and blood type O.