TV-Series
Description
Birthday is a carefree and energetic young man who works as a private investigator in Yokohama. He is a Minimum Holder, an individual born with a special supernatural ability that is activated by a specific action. In his case, Birthday can manipulate electricity by biting the end of a taser or making physical contact with another electrical conductor. His ability allows him to channel and amplify external electrical sources, and he is completely immune to electric shocks, even able to bite high-voltage power lines without harm. He often carries a battery or stun gun to ensure a ready power supply for his fights.

Birthday is a young man with blond hair that features a distinctive pink shading, though his eyes are typically hidden behind a pair of sunglasses that he rarely removes. His usual outfit consists of a yellow shirt and a tracksuit, which is dark red in the first season and black in the second season, completed by a pair of sandals. He also has a tattoo of a black skull on his right lower leg.

Personality-wise, Birthday is the embodiment of living life without regrets. He has an absurdly relaxed and jovial demeanor, always grinning whether in daily life or during battle. His nature is loud, extroverted, and he rarely stays still. He enjoys making dirty jokes, flirting with almost anyone he meets, and teasing more reserved individuals. This carefree attitude often lands him in trouble, such as when he was wrongfully arrested for a bombing while trying to impress some women. Despite this playful and sometimes lewd exterior, Birthday is deeply loyal and considerate. He hates pessimists, quitters, and those who constantly complain, and he has a strong distaste for cruelty and injustice. He is intelligent in a cunning, street-smart way and often prefers to play dumb or hide his own problems and weaknesses behind a smile.

Birthday has had a debilitating, incurable illness since childhood, a condition that was supposed to claim his life before he turned ten. As a child, he underwent a risky surgery that suppressed the symptoms, but the illness remained latent and could resurface at any moment. This constant threat of death is the driving force behind his philosophy of having fun and trying everything life has to offer, as he refuses to have any regrets. He met his partner, Ratio, when they were both very young. Ratio, whose Minimum allows him to see when someone will die, told Birthday that he would die soon. Rather than despairing, Birthday hated Ratio's gloomy demeanor and made a bet: if Birthday survived his surgery, he would "kill" Ratio's former self as the "Prophet of Death." Birthday miraculously survived and has since dedicated himself to upholding that promise, clinging to life with fierce determination.

His role in the story is primarily as a member of the Hamatora detective agency, where he partners with Ratio. Their contrasting personalities—Birthday's impulsive and loud nature versus Ratio's calm and reserved demeanor—complement each other. Birthday is often the one dragging Ratio into various odd jobs and money-making schemes. He shares a deep bond with a friend from high school named Chiyuu, who cares for him so much that she joins a questionable organization in search of a "Healing Minimum" to cure his illness. He is also physically attracted to Honey, though his advances are consistently ignored or rejected. Over the course of Re: Hamatora, Birthday's hidden struggle becomes a central point of his development. The side effects of using his Minimum cause his dormant illness to relapse with severity. True to his nature as a Stepford Smiler who hates showing weakness, he hides his worsening condition—coughing up blood and growing weaker—behind his usual smiles and jokes to avoid worrying his friends, especially Ratio. It is only when he can no longer hide the truth that he is hospitalized. In the end, after a major crisis is resolved, a Minimum Holder with healing abilities is able to cure Birthday of his illness permanently, finally freeing him from the prophecy of death that had loomed over his entire life.
Cast