Mai Ninomiya, a supporting figure marked by entangled relationships and layered emotions, shares a steadfast bond with Tsuneo Suzukawa as both childhood companions and coworkers at a diving shop. Her unspoken affection for him fuels simmering jealousy toward Josee, a wheelchair-bound woman forging a profound connection with Tsuneo, yet this tension intertwines with a persistent undercurrent of protectiveness toward those she holds dear. Her physical traits include a pale complexion, a willowy frame, and chin-length chestnut hair styled with blunt bangs that veil her left eyebrow and eye. Piercing blue eyes contrast her otherwise muted aesthetic, balancing youthful charm with a subtly guarded aura. Mai’s demeanor wavers between unwavering allegiance and self-serving impulses. Though outwardly cheerful and encouraging of Tsuneo’s ambitions, latent possessiveness and defiance occasionally surface, particularly in conflicts involving Josee. This dichotomy paints her as torn between sincere devotion to Tsuneo and bitter resistance to his deepening ties with her rival. Rooted in a shared history with Tsuneo and a background as an adept swimmer, her past lacks elaboration on familial ties or formative experiences. Her narrative arc remains anchored to the evolving love triangle, her choices and unresolved tensions with Tsuneo and Josee shaping her trajectory. The name Mai (“dance”) and Ninomiya (“second shrine”) adhere to Japanese etymological traditions, mirroring her role as a secondary yet pivotal force within the central dynamic.