Oburi, a teenage orphan molded into an assassin by corrupt detectives Akai and Kanie, balances a dual life as a part-time shop employee and a lethal operative specializing in explosive bullets. His early attire—a white skull cap, green shirt, and knee-length shorts beneath a white coat—evolves into a blue short-sleeved shirt, blue shorts with red stripes, and an orange hoodie, contrasting his blue hair and light green eyes.

His alliance with Sawa, a fellow orphaned assassin, anchors his emotional growth. They share refuge in a cat-filled warehouse, offering solace after missions. Though compassionate toward strays and protective of Sawa, Oburi wields calculated ruthlessness, such as confronting Akai with a blade to demand independence.

After fulfilling three final assignments to sever ties with his manipulative guardians, Oburi triggers Akai’s order for Sawa to execute him. During their clash, he exposes Akai and Kanie’s culpability in Sawa’s parents’ murder—a truth she already harbored—cementing their defiance. Surviving a SWAT ambush with Sawa’s aid, Oburi endures Akai’s retaliation, forced to watch Sawa’s assault.

Following Sawa’s lethal retaliation against Akai and Kanie, Oburi is shot by a child assassin while returning to her. His survival remains uncertain as Sawa waits in his loft, poised for an ambiguous future as unseen footsteps approach.