Toru Usuyama is a supervisor in the Quality Insurance Department at Sunlight Beverage, serving as the direct superior to Sota Saeki. His professional demeanor is consistently serious and strict, reflected in his responsibilities which include regularly reprimanding Tatsuru Miyazumi for reckless sales decisions. He has black hair, black eyes, and blood type A, maintaining a serious expression that reinforces his strict personality.

Usuyama previously played badminton but stopped prior to the series' events. Miyazumi makes multiple attempts to recruit him for the company's badminton team, though Usuyama initially resists returning to the sport. His character arc involves a later comeback to badminton after years away. This return is influenced by the need to balance his responsibilities as a family man with his rekindled athletic pursuits; his supportive wife provides motivation during this transition. His journey explores returning to a passion later in life while managing adult obligations.

His interactions focus on workplace dynamics with Saeki and Miyazumi, alongside his personal life as a married individual rediscovering competitive badminton.