Mr. Daïmon, the authoritarian head coach of the girls’ volleyball team, enforces a harsh training regimen marked by physical punishments. He slaps players for minor errors, even post-victory, believing intimidation enforces discipline. The anime amplifies his brutality beyond the manga’s marginally tempered portrayal. Initially dismissive of the protagonist’s natural talent, he underestimates her potential, fueling her resolve. His relentless methods inadvertently forge her resilience and determination. Later coaching a professional team, he recruits former rivals like Nami, maintaining his unyielding strictness. European releases censor his violent interactions to soften their brutality. Official media leaves his background and motivations unexplained, offering no insights into his coaching philosophy or personal relationships. Without redemption arcs, he remains a static catalyst for adversity-driven growth.