Hikage Miyakawa, a sharp-witted fourth-grader in class 4-1 at Sakura-en Public Elementary, navigates childhood while managing the consequences of her older sister Hinata’s obsessive otaku merchandise purchases. Their strained finances force meals dominated by tofu, sparking Hikage’s vivid daydreams of hamburger steak and bacon. Her tsundere demeanor masks genuine worry for Hinata, oscillating between scolding her sister’s reckless spending—like replacing discarded doujinshi instead of groceries—and fiercely defending her during school accusations of theft.

Resourceful beyond her nine years, Hikage hunts supermarket discounts, consults teachers for budgeting tips, and tests luck with lottery tickets, all while enduring hunger-induced vegetarian punishments. She dismisses her teacher Kazuhiko Ōsawa’s impractical advice, acutely aware of luxuries like fast food that classmates take for granted.

In media cameos, she appears briefly in *Lucky Star*—notably attending a culture festival prematurely due to Hinata’s error—and anchors the spin-off *Miyakawa-ke no Kūfuku*, where fleeting moments, like savoring tofu steak with her sister, reveal glimpses of vulnerability. Visually, her short blue hair in anime contrasts with game adaptations featuring long braids, while her 134 cm frame and upward-slanted light blue eyes cement her as the series’ smallest figure.