Santaro Mita, ace pitcher and relief specialist of Minato City’s tight-knit Minato Tribe, thrives in their camaraderie-fueled world of Extreme Baseball (XB). His dual role as catcher pairs lightning-fast reflexes with forcefield-equipped gear designed to neutralize hypersonic-speed projectiles, a non-negotiable defense in XB’s high-stakes matches. Though vain and prone to bravado, the 145 cm right-hander channels fierce loyalty into protecting his tribe, serving as an older brother figure who bonds with teammates like Shun Kamiya, Haru Shirokane, and Taiga over diner meals at LOVELY OCEAN.

Santaro’s superhuman athleticism enables acrobatic feats—scaling buildings via gravity-defying wall leaps—while his combat gear amplifies defense against lethal velocities. Tactical brilliance shines in his signature moves: the "Magic Pitch No. 2 - Inspire," a morale-boosting fastball, and the "Phantom Sphere," a ricocheting projectile that disorients foes with hallucinations. These skills cement his hybrid role as tank and support, orchestrating crowd control and team synergy.

Shun Kamiya’s death fractures the tribe’s spirit, but Santaro helps steer them through grief to honor their fallen star. Their resurgence culminates in a defiant victory against the Adachi Tribe, reigniting their competitive fire. Santaro further anchors the group’s identity through simulations recreating their peak performances, proving indispensable to their legacy.

While his early life remains shrouded, Santaro’s existence orbits the tribe—right-handed in pitching and batting, born March 30. His narrative weaves through Neo Tokyo’s cutthroat XB leagues, balancing unity against evolving threats, his growth a testament to resilience and collective purpose.