Shukichi Akai, later adopting the surname Haneda, occupies the middle position among the Akai siblings. Born in England to Tsutomu Akai and Mary Sera, his life shifted seventeen years ago when his father vanished amid the Kohji Haneda and Amanda Hughes murder case, prompting the family's relocation to Japan. His mother was pregnant with younger sister Masumi during this move. Older brother Shuichi departed for America to join the FBI, and Shukichi did not reunite with him until seven years later in Japan. During middle school, his classmates included Tamami Minegishi, Sumika Kawana, Masaie Hakuya, Jinsuke Ninda, and Satoko Imoto. After high school graduation, he changed his surname from Sera to Haneda, honoring the shogi player Kohji Haneda he deeply admired. He formally requested adoption into the Haneda family, though the precise connection remains undefined, and pursued a professional shogi career. He encountered Yumi Miyamoto on a train, falling asleep on her shoulder. Yumi missed her stop to avoid waking him, sparking their acquaintance and subsequent romance. Yumi eventually ended the relationship due to his perceived immaturity. Motivated solely by proving himself worthy to her, Shukichi dedicated himself to winning shogi's seven major titles. He secured the Meijin title during their relationship, though Yumi remained unaware of his profession. After achieving all seven titles and earning the moniker "Taiko Meijin," he later lost one title to rival Chikara Katsumata in a revenge match. He continues living at the Chateau Beika Condo, his former shared residence with Yumi. Outwardly cheerful and carefree—traits Yumi deemed immature—Shukichi reveals a calmer, focused demeanor during shogi matches, media engagements, or deductions. He possesses supreme confidence in his memorization skills, declaring himself the world's best. His emotional state and shogi performance are intrinsically tied to his feelings for Yumi, who functions as his muse. He prioritizes surprising her with accomplishments over alleviating her jealousy, exemplified by concealing female members of his shogi practice group. Occasional carelessness emerges, like confronting culprits alone leading to his capture. Socially awkward in family contexts, his strained first meeting with sister Masumi later prompted him to send Jeet Kune Do tutorial videos to strengthen their bond. Physically, Shukichi sports perpetually unruly hair resembling bedhead and frequently wears glasses, typically removed for shogi matches or interviews. He favors casual jerseys but dons traditional attire for shogi events. Unlike his siblings' resemblance to their mother, his appearance closely mirrors father Tsutomu. His elite shogi mastery includes holding the Meijin title and briefly all seven major titles. An eidetic memory enables instant recall of complex codes after brief exposure. His deductive abilities exceed sister Masumi's; he advises her on cases via phone and once identified a culprit faster than Conan Edogawa. Masumi views him as the "smart" counterpart to Shuichi's "strength." Key family events include his birth 28 years ago, the Japan relocation 17 years ago after Tsutomu's disappearance, and the beach reunion with Shuichi 10 years ago. Three years ago, he and Mary moved to London believing Tsutomu alive, but Mary was poisoned by Vermouth with APTX 4869, regressing to childhood. Masumi returned to Japan seeking an antidote while Shukichi remained focused on shogi. In *The Scarlet Bullet*, he travels to Nagoya intending to introduce Yumi to Mary during the WSG Hyper Linear train launch. Yumi becomes intoxicated and publicly accepts a marriage proposal. His direct involvement in the film's central incident is minimal, primarily advancing subplots involving Yumi and Mary. Regarding Conan Edogawa, Shukichi recognizes him as Shuichi's ally, likely informed during post-faked-death communications. He references Conan's deductive skills during their first joint case but shows no awareness Conan is Shinichi Kudo. He asks Masumi if she met "the wizard" (Shinichi) without connecting him to Conan, indicating ignorance of APTX 4869's effects.