ONA
Description
The character known as Death Metal Retsuko is the hidden, cathartic alter ego of Retsuko, a 25-year-old red panda working as an accountant for a trading firm in Tokyo. While her public-facing identity is that of a diligent, soft-spoken, and polite young woman who endures long hours, sexist treatment from her supervisor, and the petty frustrations of office life, her death metal persona emerges as a direct psychological response to this suppressed rage. The name Retsuko itself contains the kanji for fury or rage, which visually manifests when she unleashes this alternate self.

When the pressures of her daily existence become overwhelming, Retsuko visits a karaoke box to scream her frustrations into a microphone, transforming physically and vocally. During these performances, her appearance shifts dramatically from her usual timid demeanor to a fierce metal visage featuring corpse paint-like markings around her eyes, glowing blue eyes, sharpened teeth, an elongated devilish tongue, and the kanji for rage appearing on her forehead. The once-gentle red panda adopts a harsh, guttural male-sounding death growl, a stark contrast to her normal speaking voice. This transformation is a visual representation of her internal emotional release, often depicted with fiery auras or imagined destructive power, such as cutting through her desk with a chainsaw.

The core motivation driving Death Metal Retsuko is the need for emotional survival and self-expression. Unable to confront her incompetent bosses or inconsiderate coworkers directly due to societal and workplace pressures, Retsuko uses death metal as a private outlet to vent her specific grievances. The lyrics of her songs are direct, unfiltered rants about her demanding boss, Ton, the annoying antics of coworkers like the hyperactive hippo Hippatrica or the self-serving Tsunoda, and her disillusionment with the soul-crushing nature of capitalist office work. For Retsuko, this ritual is a form of guided meditation that prevents her from completely breaking down.

Within the story, Death Metal Retsuko serves as the central narrative device that reveals her inner truth. Initially a deeply private shame, this persona becomes a point of connection when her senior coworkers, the secretary Washimi and the marketing director Gori, discover her secret. Rather than being repulsed, these powerful women are impressed and become her allies, marking the beginning of Retsuko's journey toward self-acceptance. Her relationships are defined by who knows about this hidden side. Her close friend and coworker Fenneko is aware, as is her longtime admirer, Haida the hyena. When she dates characters like the aloof Resasuke or the wealthy Tadano, her willingness to share her death metal singing acts as a test of intimacy and authenticity.

The development of Death Metal Retsuko mirrors Retsuko's own character arc. In earlier episodes, this persona is purely a secret coping mechanism, a stark contrast to her passive office life. As the series progresses, she learns to integrate this aggressive passion into her identity. She begins performing death metal in public, turning what was once a source of shame into a lucrative side career and a source of empowerment. In later seasons, this newfound agency allows her to confront corporate corruption and navigate complex relationships on her own terms, eventually marrying Haida after years of mutual growth. The death metal voice ceases to be merely a tool for screaming about a bad day and becomes the voice she uses to demand respect and pursue meaningful change.

In terms of notable abilities, beyond the physical transformation and the superhuman vocal shift, Death Metal Retsuko possesses a singing voice of extraordinary power. Her karaoke sessions are often depicted as being capable of cracking walls, shaking neighboring rooms, and physically affecting the environment around her with the sheer force of her sound waves. While harmless in her private booth, this ability represents the immense pressure she holds inside, suggesting that her rage is not just an emotion but a tangible force waiting to be released. She also exhibits minor shapeshifting and toon force abilities, such as her face contorting into demonic metal singer aesthetics.