Komine Natsuko

“Big Sis!”—my cousin, the older sister I want to throw myself into her arms and rely on. She's cheerful, thoughtful, and deeply compassionate, valuing feelings over reason.

She runs a motorcycle delivery service for the village elders and is beloved by everyone. Her only flaw is occasionally pushing her own strong-willed, opinionated views—her “Gianism” (“What's yours is mine, and what's mine is mine”).

According to Natsuko, she has a habit of clinging and insists it's just natural human affection, but she only does this to the protagonist, her beloved little brother figure.

She doesn't mean to seduce him, but her inherent lack of shame and guard in these matters makes her a complicated older sister with plenty of questionable behavior.