Sasaki Nako (佐々木 奈子) is a 12-year-old transfer student arriving at an all-girls school in a small island town. She initially faces an adjustment period to her new surroundings. Nako possesses a cute appearance and a friendly nature that quickly endears her to classmates. Her energetic and curious personality naturally leads her into adventures and lighthearted mischief with her friends. She is typically seen in her school uniform or age-appropriate casual clothing. Within the narrative's themes of adolescence and growing awareness of sexuality, Nako sometimes encounters situations reflecting curiosity about relationships and development, contributing to the portrayal of emotional growth during youth. As the story progresses, she integrates into the town and school community, embracing her newfound friendships and experiences while navigating the complexities of adolescence.