|Date of Birth||June 10, 1995|
|Family||Shiida Kichi (older sister)|
Hirona is a 18-year-old temporarily 464 idol. She has no Zodiac sign due to being temporarily. Hirona is the little sister of wannabe idol Shiida Kichi.
Hirona grew up in a family with one older sister and divorced parents. Her sister Kichi wanted to become an idol and would usually play being one with Hirona. By the time Hirona was 16, Kichi tried to sing in front of an audience but didn't have a singing voice, in opposite of her little sister. Knowing Hirona didn't have any interest in becoming famous, Kichi made the deal with Hirona that she'd be on stage performing and play backing while Hirona sang for her backstage. In exchange for this, Kichi promised Hirona to buy her cake, one of Hirona's favourite foods, after each performance.
Hirona is considered a lazy girl who prefers sleeping over performing. Most of the time Hirona is seen sleeping, even on some weird places, despite the situation. She's a steady sleeper but usually wakes up by the mention of cake or sweets. Hirona doesn't like excersize or practice but so far hasn't mentioned any dislike to performing.
Even though Hirona is sleeping most of the time, she seems to hear and remember things that have been said by people around her while she was asleep.
When the producers of 464 pro were looking for a new idol to temporarily replace Noboyuki, they found Shiida Kichi and invited her. Uchino already noticed that something was off and asked for an explanation when Kichi couldn't sing when she visited them. Kichi then told them about Hirona and invited her to come there for an interview. Hirona came and was hired as an idol.