Tobio Kageyama, a volleyball prodigy, enters Karasuno High as a first-year setter driven by a lifelong passion for the sport. Born December 22, he honed his skills early under the guidance of his grandfather, a former volleyball coach, earning acclaim as a "child prodigy." However, his middle school tenure at Kitagawa Daiichi unraveled due to an authoritarian playstyle that alienated teammates, culminating in their refusal to spike his tosses during a pivotal match. This defeat earned him the scornful title "King of the Court," symbolizing his perceived arrogance and failed leadership. Following his grandfather’s death and rejection from Shiratorizawa Academy, Kageyama joins Karasuno. His initial insistence on flawless plays over teamwork—exemplified by withholding tosses from Hinata Shoyo—echoes past conflicts. Mentorship from setter Sugawara and coach Ukai sparks gradual change, pushing him to tailor his techniques to teammates’ strengths and prioritize unity over control. Academic hurdles emerge in *VS Failing Grades* when Kageyama and Hinata fail exams, jeopardizing their Tokyo training camp. Their frantic efforts to pass a make-up test—negotiating with the vice principal and cramming with peers like Yachi and Yamaguchi—reveal his vulnerability off-court and reliance on collective support. Renowned for pinpoint serves, tactical spatial awareness, and inventive strategies like the "falling toss" designed for Hinata, Kageyama’s prowess earns him a spot at the All-Japan Youth Training Camp. Though blunt and prone to outbursts during matches, he confronts his flaws, apologizing for regressions and striving to communicate more effectively. Post-graduation, Kageyama ascends to the V. League’s Schweiden Adlers and Italy’s Ali Roma, competing internationally at events like the 2016 Rio Olympics. Physically maturing to 188 cm with a refined hairstyle, his dynamic with Hinata evolves from rivalry to symbiotic partnership, each propelling the other’s growth. Kageyama’s arc traces a solitary genius learning empathy and collaboration, shaped by personal loss and early setbacks. His relentless drive, tempered by trust and adaptability, underscores the balance between individual brilliance and collective triumph.