Hinata Hoshino, a spirited fifth-grader and younger sister to the shy, introverted Miyako, radiates cheerfulness and energy. Her deep admiration and sister complex drive a constant desire to stay close to Miyako, affectionately dubbed “Mya-nee.”

Hinata’s vibrant social circle includes classmates Hana Shirosaki and Noa Himesaka. Noa frequently seeks bonding moments, like sharing shaved ice during a group excursion, while Hana joins her in snack-filled gatherings and cosplay sessions arranged by Miyako. Despite these friendships, Hinata prioritizes her bond with her sister above all.

During a preparatory outing at Hana’s grandmother’s house, Hinata steps into a leadership role, coordinating activities like rafting and grape-picking. This experience marks her growing independence as she balances her affectionate nature with a newfound ability to thrive beyond Miyako’s immediate presence, gently encouraging peers like Noa to foster connections.

At home, Hinata shares a warm relationship with her mother Chizuru, who gently nudges Miyako out of her shell without curbing Hinata’s outgoing spirit. School collaborations with classmates Koyori Tanemura and Kanon Konomori further round out her interactions, though these remain briefly sketched.

Details about her background or expanded media portrayals beyond the main series and film remain unspecified.