Sayaka, a supporting character, relocates to a coastal rural town with her mother and older brother, Takeshi, settling into Marnie’s former mansion. Driven by curiosity about the estate’s history, she uncovers Marnie’s concealed diary, a pivotal artifact in deciphering the enigmas linking Marnie’s life to Anna. Slender and slightly younger than Anna, she has light brown hair styled in pigtails, teal eyes, and oversized round glasses. Her cheerful demeanor is mirrored in her outfit: a yellow halter dress with orange and sage-green stripes, white socks, and pink-strapped shoes. Friendly, empathetic, and persistently upbeat, she prioritizes others’ welfare, channeling her proactive spirit into investigating Marnie’s past. Partnering with Anna, she deciphers diary entries and local lore to reconstruct fragmented truths. When a storm brews, her intuition alerts her to Anna’s distress, prompting a determined search that ends with discovering Anna feverish near the marsh—an act emphasizing her loyalty and protective instincts. Her narrative function bridges Anna’s emotional evolution with Marnie’s buried legacy. She propels Anna toward clarity by sharing recovered diary excerpts and joining her to meet Hisako, an elderly painter holding keys to Marnie’s story. Their collaboration fosters mutual growth through curiosity and compassion, though her focus stays anchored in present-day revelations. Her family—an unnamed mother and Takeshi, who jokingly dubs her “Sherlock” in certain adaptations—subtly nods to her sleuth-like traits. Etymologically, her name blends “color” and “fragrance,” reflecting her role in illuminating the narrative’s themes of memory and identity with vivid resonance.