OVA
Description
Originating from Okinawa Prefecture, Umiko Ahagon possesses a tanned skin complexion. She is 25 years old, stands 162 cm tall, and has blood type AB. Her birthday is July 20, placing her under the Cancer zodiac sign. Umiko features long brown hair reaching her waist, with one strand often hanging over her face, and striking blue eyes. Distinctive white X-shaped hairpins adorn the left side of her hair. She favors outfits in green, black, or dark red.

Serving as the programming chief at Eagle Jump, Umiko enforces strict workplace discipline and swiftly corrects errors or employee negligence. Her demeanor is harsh and intimidating while working, though she later reflects self-critically, concerned about pushing colleagues away. A passionate military enthusiast, her eyes light up discussing firearms and equipment, although her fervor often unsettles others. She intensely dislikes her surname "Ahagon," finding its sound uncomfortably close to "ahegao" and resenting its obscure Okinawan origin. Insisting on being called "Umiko," she retaliates against surname usage—particularly by Kou Yagami—with airsoft gun fire.

Umiko's military passion runs deep, encompassing extensive knowledge of firearms and gear. Model rifles decorate her workspace, and she carries an FN Herstal Five-seven airsoft pistol. Her hobbies include airsoft games and first-person shooter titles. This enthusiasm spills into gift-giving; she presents coworkers with items like spent shotgun shells or grenade casings. She enjoys spicy foods, especially curry, and harbors a strong aversion to insects, particularly centipedes. Her skills include proficient marksmanship and efficient debugging.

Her background includes transferring to Eagle Jump after Hifumi Takimoto's hiring, where she quickly earned respect and rose to programming chief. She negotiated terms with director Shizuku Hazuki, stipulating forehead flicks for unnecessary specification changes increasing team workload. Umiko humorously references her past role as a corporate spy before joining Eagle Jump.

Relationships define much of her story. Her dynamic with Nene Sakura began contentiously during Nene's internship, where Umiko threatened termination over mistakes but later acknowledged Nene's talent for identifying bugs. Umiko became Nene's programming mentor, maintained contact post-internship, and assisted with Nene's independent game development, forging a lasting mentorship. She shares a vitriolic friendship with Kou Yagami, marked by mutual teasing over her surname and airsoft retributions. Interactions with Hazuki are blunt regarding workflow disruptions, while she bonds with Hajime Shinoda over shared interests in weaponry and action games.

Umiko's character development shows initial rigidity softening through her ongoing mentorship of Nene and sustained friendships. Her leadership expanded when she accepted the chief programmer role under specific conditions to protect her team's workload. She participates in company events, donating military-themed items like airsoft guns as raffle prizes.

Trivia notes her presence in the mobile game "Kirara Fantasia" alongside Nene. She built a rooftop shooting range at Eagle Jump and employs playful airsoft pistol threats to enforce workplace norms.