Sora Hirota, nicknamed Sora-chan, serves as a Stoker in the Engineering Department aboard the destroyer Harekaze. Her responsibilities include maintaining and operating the ship's engines, skills rooted in childhood experiences spent fixing boat engines with her father on their family cruiser in Hayama Town, Miura District, Kanagawa Prefecture. She forms part of a close-knit quartet with Reo Wakasa, Sakura Ise, and Runa Suruga, often sharing gossip during activities like beach volleyball or card games. Sora exhibits a sarcastic and ironic personality, frequently acting as the group's straight-talker who balances the dynamic with pointed or cynical remarks. Despite this witty demeanor, she demonstrates reliability and seriousness, particularly in her technical duties and during strategic games like mahjong, where her cautious and methodical style leads to consistent wins. Physically, she has short brown hair typically adorned with a red ribbon headband, blue eyes, stands 157 cm tall, and possesses a medium build. She prefers wearing black clothing, and her blood type is O. Her birthday falls on December 1, making her a Sagittarius. Academically, her strongest subject is science, particularly physics, while she dislikes Japanese. She holds certifications as a Third-Class Marine Engineer and a Third-Class Hazardous Materials Handler. Her culinary preferences include okonomiyaki and mizu yokan, though she dislikes junsai. She often references the saying "Morning three, evening four" to highlight pragmatic thinking. While she admires the Blue Mermaids' ships, her own career aspirations remain undecided, reflecting her practical outlook shaped by those early engineering experiences.