Asuka Sugo, daughter of Sugo Corporation CEO Kojiro Sugo, steps into the role of acting manager and communications lead for the Sugo racing team during her brother Osamu’s absence. A steadfast presence both on and off the track, she anchors driver Hayato Kazami through pivotal challenges, from processing the psychological aftermath of the Zero Zone incident to mitigating the intense pressures of professional racing. What begins as a bond forged through shared childhood experiences gradually deepens into romance, leading to their engagement amid the high-stakes events of *Zero*.

Climactic tensions emerge when Hayato defies risks to return to racing, fracturing their engagement temporarily. Reconciliation follows as Asuka guides him in confronting lingering fears and refining his technical approach, while Hayato works to mend their trust. Parallel to her racing career, she enrolls in Columbia University’s medical program, driven by a resolve to rehabilitate injured athletes—a testament to her expanding empathy and leadership.

Her strategic acumen shines in crises, from dismantling kidnapping plots targeting the team to coordinating security operations with ally Bleed Kaga. She navigates rivalries with tact, exemplified when challenging Randoll over his derogatory remarks toward Hayato, balancing firmness with diplomacy.

By the conclusion of *SIN*, Asuka and Hayato solidify their union through marriage, intertwining their personal and professional lives. Her journey traces an evolution from loyal childhood companion to a multifaceted leader—medical student, crisis negotiator, and racing strategist—embodying a balance between ambition and unwavering support for those she champions.