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Kaji's sharp-witted, chain-smoking senior colleague whose cynical outlook on corporate life masks her own buried creative dreams, inadvertently becoming Kaji's reluctant workplace confidante.

A razor-sharp corporate fixer whose friendly demeanor toward Kaji belies her role as the unseen hand that silences leaks and disappears inconvenient truths for the company.

A former rival gang member from Reki's delinquent days, now released from prison, whose sudden reappearance in their neighborhood threatens to draw the couple back into old violence.

A former high school rebel with a fierce reputation, he now works a mundane office job and struggles to reconcile his fiery past with the quiet domestic life he shares with Yuto.

A gentle and dreamy soul who once drifted through school life untouched by its harshness, he now anchors his marriage to Reki while quietly fearing the return of old ghosts.

Reki's sharp-eyed older sister who runs a local café, acting as both a meddlesome gossip and an unexpected pillar of support for the couple as their past begins to resurface.

Kaji's well-meaning but overbearing section chief who assigns him endless overtime, oblivious to the personal toll it takes. He views Kaji's stoicism as reliability, never realizing he is slowly eroding his employee's marriage.

Kaji's sharp and observant coworker who sits at the adjacent desk, Mizuki serves as both a source of office gossip and an unexpected sounding board, often noticing the tension in Kaji's lunchtime calls before Kaji himself can admit to it.

Keisuke Baji from Tokyo Revengers is a fierce, unpredictable, and deeply loyal delinquent who serves as the First Division captain of the Tokyo Manji Gang; he appears reckless, violent, and impulsive, often rushing into fights without fear or concern for consequences, but beneath that wild exterior he is highly intelligent, observant, and guided by a strong personal code of justice; his background is shaped by early bonds and loyalty, especially his connection with Manjiro Sano and his closest friend Chifuyu Matsuno, which define much of his identity; Baji’s traits include courage, determination, charisma, and extreme self-sacrifice, as he is willing to endure pain or even be misunderstood if it means protecting what he believes in; his motivation revolves around loyalty, truth, and preserving Toman’s original spirit, making him a character driven more by conviction and love for his comrades than by personal gain or power.

Kazutora Hanemiya from Tokyo Revengers is a deeply unstable and tragic delinquent whose personality is shaped by guilt, trauma, and emotional breakdown; as an early member of the Tokyo Manji Gang alongside Manjiro Sano and Keisuke Baji, he initially seeks belonging but becomes mentally fractured after a serious incident, leading him to distort reality and blame others as a coping mechanism; his personality shifts between remorse, aggression, and confusion, making him unpredictable and emotionally volatile; his background is defined by loss and psychological collapse rather than simple delinquency, and his traits include instability, impulsiveness, and deep inner conflict; despite his actions, Kazutora is not purely malicious—his motivations come from guilt, self-hatred, and a desperate need to justify his pain, making him one of the most emotionally broken and tragic characters in the story.

Chifuyu Matsuno from Tokyo Revengers is calm, loyal, and highly rational, standing out as one of the most grounded members of the Tokyo Manji Gang; as vice-captain of the First Division under Keisuke Baji, he is intelligent, observant, and often acts as a strategist who supports others in chaotic situations while remaining level-headed; his background is shaped by strong bonds rather than tragedy, especially his deep respect for Baji, which heavily influences his outlook on life; Chifuyu’s key traits include empathy, honesty, resilience, and unwavering loyalty, making him someone others can rely on without hesitation; his motivation centers on protecting his friends, honoring Baji’s legacy, and helping Takemichi Hanagaki change the future, showing that he fights not for power, but for trust, justice, and the people he cares about most.

A quiet veterinarian and longtime friend who provides medical care for the shop, Yuki's unspoken affection for the trio's chaos places her squarely in the emotional crossfire when old Valhalla tensions resurface.

A gentle veterinarian who volunteers at the shop, Yuki has no ties to the underworld but a sharp eye for the pain these three men carry. She stitches up the stray—and inadvertently, the cracks between them.

One of Garvi's few trusted friends and fellow motorcycle gang member, Hansa shares his rebellious side. He understands the pressures Garvi faces and provides crucial support when his temper flares.

Arsan's true best friend amidst a sea of acquaintances, Lingga grounds Arsan's chaotic energy. He navigates the fallout of Arsan's rivalry with Garvi, often acting as the voice of reason.

Marcus's cold, demanding boss who unwittingly becomes one of his first 'targets' as the System's demands escalate.

An enigmatic and demanding artificial intelligence that controls Riku's life, rewarding compliance with pleasure and punishing defiance with pain.

Elara's pragmatic best friend, who is deeply confused by Elara's sudden change in behavior and the dangerous attention she's attracting.

A cunning and ambitious noble who is deeply involved in the magical conspiracy. He sees Ren as a pawn in his grand scheme to seize power.

Kai's trusted right-hand man and the only person who glimpses the prince's vulnerabilities. He is wary of Ren's influence.