Haruna - Billlie 'youngest member' (maknae)
Who is Osato Haruna (Billlie)?
Osato Haruna is a Japanese singer under MYSTIC STORY who serves as the lead vocalist, lead dancer, and maknae of the South Korean girl group Billlie. Born on January 30, 2006, in Kishiwada, Osaka Prefecture, Japan, she performs under the stage name Haruna. Her birth date makes her an Aquarius in the Western zodiac and a Rooster in the Chinese zodiac.
Standing at 165-166 cm (5'5") with blood type A, Haruna joined MYSTIC STORY Entertainment in 2021 after the agency recognized her dancing abilities. Prior to her official debut, she trained as part of the pre-debut group MYSTIC Rookies alongside fellow members Suhyeon and Haram. On October 5, 2021, she was revealed as the fifth member of Billlie, marking her official introduction as a MYSTIC STORY artist.
Haruna made her professional debut with Billlie on November 10, 2021, through the group's first mini album "The Billage of Perception: Chapter One". As the youngest member of the group, she holds the position of maknae while contributing as both a lead vocalist and lead dancer. Her representative color within the group is blue, and her representative emoji is the turtle, which aligns with her nickname "turtle maknae". Her MBTI personality type is ESFP, though some sources note it has changed to ISTP.
Haruna's Journey to Billlie
Early dance training in Japan
Haruna developed her dance foundation at GPstudio dance academy in Japan, an institution focused on preparing dancers for opportunities in the Korean entertainment industry. Throughout her childhood, she performed at Fashion Leaders fashion shows, dancing on May 20, 2018 for BOO-YA X IRISER, on December 9, 2018 for REICA, and on May 12, 2019 for YO-KO. In September 2020, she appeared on the Japanese variety show 'Matsuko Kaigi' as part of GPstudio. Notably, fellow Billlie member Tsuki also attended GPstudio in 2020 when unable to travel to Korea for training.
Joining MYSTIC Story
MYSTIC Story recognized Haruna's dancing abilities and offered her a contract in late 2020. In November 2020, the GPstudio Instagram account announced her graduation from the academy, confirming her move to an undisclosed company in Korea. She officially joined MYSTIC Story on January 1, 2021, beginning her trainee period with the agency. During her approximately one-year training period, she participated in the pre-debut trainee collective known as Mystic Rookies. On October 4, 2021, she was confirmed as a member of MYSTIC Rookies and participated in a dance cover of Cardi B's "Up" alongside trainees Suhyeon and Haram, marking her first public exposure.
Debut with Billlie
On October 5, 2021, Haruna was revealed as the fifth member of Billlie, which also served as her official reveal as a MYSTIC Story artist. She debuted with the group on November 10, 2021, through the release of their first mini album "The Billage of Perception: Chapter One".
Haruna's Role in Billlie
Within Billlie, Haruna shares responsibility for the group's killing parts alongside fellow member Tsuki, both serving as the group's only Japanese members. Her vocal delivery features a cute and bubbly quality during performances, which contrasts with the notably deep voice she displays when speaking in Korean or Japanese. This vocal duality has become a recognized characteristic among fans, though the deeper tone remains less evident in her singing.
Beyond her performance duties, Haruna contributes to Billlie's discography as a lyricist, with her writing credits registered through KOMCA. In 2022, she wrote lyrics for "Believe" from "The Collective Soul and Unconscious: Chapter One" and "B@ck 2 where we Belong" from "The Billage of Perception: Chapter Two". She continued her songwriting work in 2023 with "Various and Precious (Moment of Inertia)" featured on "The Billage of Perception: Chapter Three".
Her artistic identity within the group extends to symbolic representations. Her Luna concept embodies the moon, earning her the nickname "Hardarling" for her sweet and kind demeanor. Her representative color remains blue, while the turtle serves as her representative emoji, aligning with the "turtle maknae" nickname referenced by fans.
Haruna Billlie Facts and Personal Life
Physical characteristics and visual
The kanji in her given name are 春 (haru), meaning spring, and 菜 (na), meaning vegetable. She identifies her beauty mark on her lower eyelid as her charm point. Her physical measurements include a height of 165-166 cm and weight ranging from 43-47 kg, with blood type A. Fans frequently note her resemblance to Lee Chae-young of Fromis_9 and Mocha of ILLIT, particularly when styling her hair in black-and-white tones with short cuts.
Personality and habits
Her MBTI personality type appears as ESFP in most sources, though INFP and ISTP have also been documented. Within the Enneagram system, she corresponds to type 9w1, characterized as the Peacemaker or Mediator. She describes her own personality as "slow" and demonstrates mental toughness in adapting to dormitory life. Besides being the only left-handed member in the group, she maintains nocturnal habits as a night owl who often remains awake until morning. Her hobbies include watching movies and playing video games.
Family and education
She is an only child, with her mother born in 1979 and father born in 1982. She attended and graduated from Renaissance Osaka High School, a correspondence (remote learning) institution in Osaka City.
Recent hiatus and return
On July 25, 2025, an intruder used physical force to damage her residence entrance door and break in, threatening her safety. Following the incident, MYSTIC STORY relocated her and arranged a medical evaluation that determined she required rest for mental stability. She returned to full activities on August 23, 2025, after her health improved significantly.
FAQs
How long was Haruna's training period? Haruna became a trainee in late 2020, making her training period just 12 months long, the shortest total training time amongst Billlie members.
Who does Haruna share a room with in the dorm? In Billlie's dormitory, Haruna shares a room with Tsuki, Sheon, and Siyoon.
What is Haruna's favorite Billlie song? Her preferred track from the group's discography is "overlap (1/1)".
Does Haruna have any food allergies? She is allergic to apples. Her dislikes include onions and pineapple on pizza.
What are Haruna's favorite foods? Rose pasta and chocolate rank among her preferred foods. During a Reddit AMA, she specified rosé jjimdak as a favorite dish. Her preferred ice cream flavor is chocolate.
Who is Haruna's role model? Red Velvet's Seulgi serves as her role model.
Which member would Haruna choose to be for a day? If given the opportunity to live as another member for a day, she would choose Haram.
What is Haruna's favorite season? Spring represents her preferred season, which aligns meaningfully with the meaning of her given name.
What superhero does Haruna prefer? Spider-Man is her favorite superhero.
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