Kaoru Tachibana

Kaoru Tachibana is Sota's elder sister by circumstance rather than blood, and a dedicated member of Hokuei University's women's volleyball club. Known for her strict and serious approach to the sport, she practically pressured her younger brother into taking on the role of team manager. While she often pokes fun at his physique in their day-to-day interactions, the moment any of her teammates sets their sights on Sota, her composed exterior cracks to reveal a flustered, fiercely protective side — proof that beneath her bold personality lies a deep care for family.