Sayuri Kurata, an 18-year-old student from an affluent family, exudes kindness through her perpetual smile and signature laughter. Her formal speech, marked by honorifics and deliberate avoidance of contractions, reflects both her upbringing and a conscious detachment from her identity—a coping mechanism stemming from the trauma of her younger brother Kazuya’s death. This tragedy drove her to refer to herself in the third person and attempt suicide, leaving a lingering wrist scar as a testament to her initial self-blame. Through gradual healing, she confronts her guilt, recognizing her innocence in Kazuya’s passing and striving to rebuild her life beyond its shadow.

As Mai Kawasumi’s closest confidante, Sayuri exhibits steadfast loyalty, meticulously preparing daily bento meals for Mai and later extending their secluded lunches to include Yuichi Aizawa, shielding them from disruptive peers. When Mai faces expulsion, Sayuri leverages her former student council presidency and social influence to orchestrate a diplomatic resolution, securing her friend’s reinstatement. Beneath her cheerful facade lies pragmatic resilience, unwavering in her support even as supernatural threats encroach upon Mai’s life.

Her fractured family history—a strict father and solitary responsibility in raising Kazuya, with whom she shared only one meaningful exchange before his death—fuels her yearning for collective joy. She finds solace in shared moments with Mai and Yuichi, cherishing these connections as embodiments of her ideal communal happiness. While her story intertwines with Mai’s arc in the primary narrative, an optional visual novel segment delving into her past becomes accessible after completing Mai’s route. Physically, she stands 159 cm tall with a slender 45 kg frame, her chest-length brown hair adorned by a green checkered bow that accents her school uniform.