Gaju was born in Gunma Prefecture, where he and his younger sister Mako began dancing at a young age under the guidance of local teachers. The two developed strong technical skills and a natural chemistry as a sibling dance pair, quickly rising in the Junior Dance competitions, frequently competing against top dancers such as Kiyoharu Hyoudou and Shizuku Hanaoka.

When Gaju enters high school, he moves to Tokyo to continue his education and receive more advanced training, while Mako remains in Gunma. The geographical distance and emotional tension between the siblings cause a rift in their partnership, leading Gaju to pair with Shizuku Hanaoka Kiyoharu’s long-time partner creating significant drama and competition in the dance world.

Gaju has a sharp and imposing appearance, with light brown hair styled upward, strong facial features, and a confident posture. His dancer’s physique is tall and athletic, which contributes to his commanding presence on the dance floor. He often wears dark, sleek ballroom practice attire, and during competitions, his formal outfits are always bold and perfectly fitted.

His intense gaze and expressive body language reflect his strong will and unyielding focus, both in and out of competition.

Gaju is fiery, blunt, and highly ambitious. He often comes across as arrogant and overconfident, especially when he criticizes others or asserts his opinion. However, beneath his pride is a dancer who is passionately dedicated to his craft and holds high expectations for both himself and his partner.

He has a tendency to be harsh, particularly toward his sister Mako, whose gentler approach to dancing contrasts with his more aggressive style. Despite this, Gaju deeply cares for Mako and is visibly affected by her growth and independence. His confrontational attitude masks an underlying respect for skill, effort, and authenticity in dance.

• From Partner to Rival
  Gaju first appears as Mako’s older brother and dance partner, but their creative and emotional disconnect leads him to abandon Mako to partner with Shizuku Hanaoka, causing a ripple effect that shakes up the dance circuit. His decision serves as a catalyst for Mako to develop her own strength and for Tatara Fujita to step up as her new partner in the Tenpei Cup.

• Tenpei Cup Arc
  The Tenpei Cup features a major face-off between Gaju/Shizuku and Tatara/Mako. Gaju’s experience and power dominate early on, but Tatara and Mako’s growing chemistry impresses the judges and pushes Gaju to acknowledge their growth. This event marks a turning point in Gaju’s character, showing that while he’s competitive, he also respects genuine talent and emotional performance.

• Ongoing Influence
  As Tatara and Chinatsu progress as a couple, Gaju remains in the narrative as a senior figure and rival, often providing critical commentary or serving as a contrast to Tatara’s style. His own partnership with Shizuku continues to evolve, though it is tinged with competitiveness and a desire to surpass Kiyoharu, Shizuku’s original partner.