Asahi Azumane, a third-year at Karasuno High School, was once known as the ace who quit volleyball after a crushing defeat against Date Technical High School. Seeing his spikes repeatedly blocked shattered his confidence, leading to a crisis of self-blame and his departure. Persistent first-years Shoyo Hinata and Tobio Kageyama eventually lured him back, reigniting his passion and helping him reclaim the ace title. Standing 184.7 cm (later 186.4 cm) with long hair typically in a bun and a distinct goatee, his imposing look intimidates others, often causing mistaken assumptions about his age or character. Beneath this rugged exterior lies a gentle, sensitive, and deeply introverted spirit, possessing a fragile "glass heart" that feels criticism and setbacks intensely, fueling his anxiety. His appearance changes little during high school, though he adopts a looser bun after manager Kiyoko Shimizu warns tight styles risk hair loss. His volleyball power is exceptional, rated 5/5, making him Karasuno's strongest spiker. He blasts through multiple blockers with spikes reaching 333 cm, specializing in high, slightly off-net tosses hit with immense force. He later develops jump serves, back-row attacks, and mid-air "delay" techniques to evade blocks. While his speed (2/5) and stamina (3/5) are average, his receiving and blocking significantly improve through training. Key relationships drive his growth. He shares a close bond with fellow third-years Daichi Sawamura and Koushi Sugawara, who provide vital emotional support. His dynamic with libero Yu Nishinoya proves especially significant; Nishinoya’s steadfast belief in him ("I’ll handle the blocks—you just spike!") helps break down mental barriers. Their contrasting natures—Asahi’s caution versus Nishinoya’s boldness, underscored by their mirrored birthdays (01/01 and 10/10)—highlight their complementary roles. After rejoining, Asahi learns to trust his team, vowing never to relinquish the ace position again. His journey involves repeatedly confronting insecurity. A rematch against Date Tech sees him score the winning point by spiking past Aone’s block, cementing his comeback. At nationals, he endures targeted strategies like Kamomedai’s "dedicate shifts," persisting in demanding tosses to show resilience. Growth culminates in leadership moments, including acting as court captain and encouraging pressured teammates. Post-graduation, he becomes an apparel designer in Tokyo and later embarks on a world trip with Nishinoya in 2021. His story embodies perseverance, captured by his resolve: "No matter how many walls I hit, I’ll keep spiking." He leaves a quiet yet profound legacy, balancing innate gentleness with an ace’s fierce determination.