Nanako is the seventh of ten siblings and the younger sister of Rokuro and Goro. She joins her two brothers on their journey after twelve amulets that protect the world are shattered, spreading a curse that affects nearly everyone except Rokuro. Their goal is to save their family and eventually the world. Nanako is a caring, honest, and bright individual who sometimes tries to act more mature than her age. She has a deep love for singing and dreams of traveling the world as a singer, a passion that drives her personal aspirations alongside the family mission. In the group, she serves as an emotional anchor with her warm and cheerful disposition, often balancing Rokuro's unreliability and Goro's more cautious nature. Her key relationships are with her brothers, particularly Rokuro, whom she supports on his adventure, and Goro, whom she relies on for guidance. While she does not possess any magical tools or special combat abilities, her singing talent and optimistic spirit form her notable traits. Over the course of the story, Nanako remains a steadfast companion, contributing to the group's cohesion and morale as they face the spreading curse.