Movie
Description
Haruyuki Arita is a junior high school student with short stature and an overweight physique, brown hair, and black eyes. He typically wears his Umesato Junior High uniform: a white dress shirt, blue blazer, and tie. His physical appearance shifted after his parents' divorce; he maintained a normal weight during childhood.

A significant trauma shapes his background: at age seven, he overheard his parents' divorce discussion where neither wanted custody of him. This event led to his withdrawal and subsequent weight gain. His mother, Saya Arita, rarely stayed home after gaining custody, prompting him to frequently dine at the home of childhood friend Chiyuri Kurashima. His closest childhood bonds were with Chiyuri and Takumu Mayuzumi, though he grew distant when they began dating in elementary school. Upon entering Umesato Junior High, he faced bullying from Araya and his gang, worsening his low self-esteem and driving him to escape into virtual squash games on the school's local network.

Personality-wise, Haruyuki initially displays timidity, indecisiveness, and self-doubt rooted in bullying and abandonment. After receiving the Brain Burst program from Kuroyukihime, he gradually develops confidence and determination. He prioritizes protecting his friendships with Takumu and Chiyuri despite conflicts, such as smashing Chiyuri's offered sandwich to reject perceived pity. His devotion extends to Kuroyukihime, whom he vows to support in reaching Level 10 in the Accelerated World, acknowledging his underlying desire to remain by her side. As his duel avatar, Silver Crow, he exhibits tactical cunning comparable to established Burst Linkers.

His duel avatar, Silver Crow, manifests as a slender silver-armored figure with retractable wings enabling flight—a unique ability in the Accelerated World. The avatar's metallic color and flight capability reflect Haruyuki's subconscious desires: the metal symbolizes emotional shielding from parental rejection, while flight represents escape from his burdens. Silver Crow possesses enhanced physical combat skills like Punch and Kick, along with abilities such as Optical Conduction for redirecting light-based attacks. Special moves include Headbutt and later Incarnate System techniques like Laser Sword. The avatar also integrates Enhanced Armaments like Metatron's Wings, boosting aerial capabilities.

In the Infinite Burst narrative, Haruyuki participates in a territorial battle between his legion Nega Nebulus and Great Wall. A massive black storm disrupts the Accelerated World during this conflict, disconnecting all Burst Linkers and disabling the Brain Burst application in the real world. Facing this crisis, he collaborates with Kuroyukihime and other legion members to investigate the disturbance. The threat's scale necessitates an alliance with rival Kings, including Green Grandee, to restore stability. Real-world effects like malfunctioning security cameras intensify the urgency. Haruyuki's role underscores his commitment to preserving the Accelerated World and his connections within it, particularly with Kuroyukihime.

His development across media shows progression from isolation to leadership, leveraging his virtual abilities to confront systemic threats while addressing his insecurities. The Infinite Burst events further cement his resolve to protect both the Accelerated World and his relationships.