Mari Ishimatsu appears exclusively in the 2005 live-action drama adaptation as a volleyball player for Fujimi High School, competing alongside protagonist Kozue Ayuhara. She engages in demanding training sessions under coach Inokuma and faces high-stakes matches against elite opponents. Throughout the 11-episode series, Mari remains a consistent presence as the team navigates internal rivalries, forms friendships, and endures intense athletic challenges. The narrative emphasizes the squad’s collective pursuit of national success, without exploring Mari’s individual background, narrative arc, or personal development.