Sadaharu Inui

A brilliant third-year regular for Seigaku, this strategist relies on his signature "Data Tennis" to dismantle opponents through meticulous observation. Originally ranked as the team's third strongest behind Tezuka and Fuji, he developed his analytical playing style specifically to overcome his long-standing losing streak against Tezuka. Though once an unstoppable elementary school doubles partner to Renji Yanagi, he now frequently anchors Seigaku’s doubles lineup alongside Kaidou Kaoru, providing the tactical depth necessary to compete with elite teams.