Shachi Yūri, a second-year Sakuragabuchi Academy student, has shared a home with the protagonist since childhood after his family discovered her orphaned on a beach. Grateful for their care, she diligently manages all household tasks, channeling her indebtedness into meticulous chores and exceptional cooking. Her meals draw neighborhood children to their doorstep, fostering a warm, communal atmosphere.

Calm and reserved, Shachi speaks with quiet formality, her politeness masking deeper emotions. She harbors a poignant belief that her sadness summons rain, a private superstition intertwining her inner world with the weather. Static electricity unsettles her, though its origins as a dislike remain unspoken.

Central to her life is her bond with the protagonist, forged through years of shared upbringing and her steadfast caretaker role. When he transforms into a cat, she is among the first to uncover the secret, joining efforts to restore him. Her past as an orphan adopted into his family forms the foundation of her identity, yet her story unfolds primarily within the main series and game, leaving broader media explorations untouched.