Description
Echika Hieda, born in Tokyo to Chikasato Hieda—a developer of the brain-implanted Your Forma—and an abusive mother who abandoned the family, grew up under her father’s neglect. Chikasato, consumed by marital strife, prioritized his Amicus companion Sumika over Echika, intensifying her isolation. A childhood birthday gift rejection triggered her father’s explosive outburst, cementing her detached persona. Despite this, she forged a career as an Electronic Investigator (Diver) at the Electrocrime Investigations Bureau, becoming the world’s youngest to earn the title due to unmatched data-processing speed.

Her accelerated cognition unintentionally harmed past partners during Brain Dives, isolating her professionally and branding her as difficult to collaborate with. This entrenched her defensiveness, though she clung to a buried yearning for connection. Paired with humanoid Amicus Harold W. Lucraft, her distrust of Amicus units—rooted in her father’s neglect—slowly eroded through joint investigations. Their partnership unearthed her capacity for vulnerability, yet miscommunications lingered.

A sudden decline in her processing speed during an anti-technology conspiracy probe led by the shadowy "E" sparked a crisis. Medical assessments blamed unresolved anxiety for the impairment, prompting her reassignment to the Investigation Support Department. There, she grappled with inadequacy and dread of obsolescence, amplified by colleagues Fokine and Sedov’s scrutiny and Harold’s unwavering concern.

Childhood friend Matoi, her sole early source of kindness, resurfaced, reigniting fears of loss—particularly toward Harold, whose concealed motives and potential exit heightened her insecurities. Despite her guardedness, she risked personal safety to dismantle E’s network and protect civilians. Solace came sparingly through reading and sleep, brief respites from her demanding role.

Echika’s gradual emotional thaw revealed nascent affection for Harold, paralleling his hesitations. Her journey—marked by confronting familial scars, societal tech expectations, and human-Amicus dynamics—evolved from isolation into fragile trust, unresolved yet persistently in motion.