Seto Shuhei, a high school basketball standout three years the protagonist’s senior, initially brushes off her childhood crush with playful dismissal, urging her to revisit her feelings when older. Her unwavering pursuit gradually softens his stance, challenging his preconceptions.

His past reveals unspoken affection for classmate Ayano Nishina, which he sacrifices to uphold a promise to friend Ko Segami, choosing loyalty over love—a decision that haunts him as he tentatively explores a trial relationship with the protagonist. This pattern of subverting personal desires to preserve friendships fuels romantic indecision, leaving him torn between lingering care for Ayano and emerging curiosity about the protagonist’s sincerity.

A protective bond with younger sister Koharu evolves from her initial hostility toward the protagonist into mutual respect, while teammate Rai’s growing interest in the protagonist sparks rivalry, drawing out rare flashes of jealousy. These dynamics nudge Shuhei toward recognizing her impact on his life, though adaptations differ in how overtly he confronts these realizations.

His arc traces a shift from perceiving the protagonist as immature to acknowledging her growth, both in stature and emotional depth. Internal clashes between residual loyalty to Ayano and deepening connection with the protagonist force introspection about where his priorities lie.

Outwardly aloof yet privately introspective, Shuhei deflects vulnerability with dry humor or detached pragmatism. On the basketball court, his assertive leadership contrasts sharply with romantic hesitancy, mirroring the narrative’s exploration of duty versus authentic emotion. Adaptation-specific resolutions chart varying paths through these tensions, preserving core struggles while allowing nuanced interpretations of his journey.