1. Overview
Ryōko Kuninaka (国仲涼子Kuninaka RyōkoJapanese, born June 9, 1979), also known by her married name Ryōko Mukai (向井涼子Mukai RyōkoJapanese), is a prominent Japanese actress and singer. Born in Naha, Okinawa Prefecture, Japan, she was initially affiliated with Palette before joining Vision Factory (also known as Rising Production). Kuninaka rose to national fame for her leading role as Eri Kohagura in the highly successful NHK morning drama series "Churasan" (2001), which earned her multiple awards, including the Best Actress award at the 30th Television Drama Academy Awards. Beyond her extensive acting career in television dramas, films, and stage productions, she has also pursued a singing career, releasing singles and albums. In her personal life, she is married to actor Osamu Mukai, with whom she has two children.
2. Early Life and Background
Ryōko Kuninaka's formative years were spent in her hometown of Naha, Okinawa, where her early experiences shaped her vibrant personality and eventual path into the entertainment industry.
2.1. Childhood and Education
Born in Naha City, Okinawa, Kuninaka was an energetic child, often described as a tomboy with short, tanned hair, frequently mistaken for a boy. During her elementary school years, she studied soroban (abacus). In junior high, she was an active member of the track and field club. For high school, she specifically chose Okinawa Prefectural Naha Commercial High School because she enjoyed soroban and was good at mathematics, but also, as she herself stated, she found the summer uniform "cute" and wanted to wear it.
During her high school years, Kuninaka did not participate in club activities, instead focusing on a part-time job at a light meal shop in Naha City. She commuted by bus almost daily after classes, and her summer breaks were particularly busy. Despite enjoying her high school life, she faced anxieties about her future and career path, often sharing these concerns with friends. She felt a sense of urgency about not having a hobby or finding something she loved, pondering what she wanted to become. It was during this period, while working her part-time job, that she was scouted. Although she felt uncertain about the prospects of a career in entertainment, her parents encouraged her, saying, "Everything is an experience. Just go and see. If it doesn't work out, you can always come back." Following this, she moved to Tokyo to pursue her career.
3. Career
Ryōko Kuninaka's career in the entertainment industry is marked by her versatility as an actress across various media and her ventures into music.
3.1. Debut and Early Career
Kuninaka made her first television appearance in 1998 as a regular cast member on the Fuji Television program "Idol High School Geino Jogakkan." The following year, in 1999, she made her debut as an actress in the TBS drama "L×I×V×E." In the same year, she secured her first lead role in a late-night drama, "Warui Onna 'Player'," also on TBS.
Her breakthrough came in 2001 when she starred as the heroine, Eri Kohagura, in the NHK morning drama series "Churasan". Her performance garnered significant critical acclaim, earning her the Broadcast Newcomer Award at the 39th Golden Arrow Awards and the Newcomer Award at the 26th Elan d'Or Awards. In 2001, she also took on her first historical drama role in NHK's "Goban no Tsubaki," for which she received the Best Actress Award at the 27th Bulgaria Golden Chest International TV Festival. In 2003, Kuninaka debuted as a singer with her single "Ryukyu Moon", which served as the theme song for "Churasan 2." She made her film debut in 2003 with "The Man Who Wipes Mirrors." In 2005, she took on her first lead role in a prime-time commercial television series, "Minna Mukashi wa Kodomo Datta," broadcast on Kansai Television.
3.2. Acting Career
Kuninaka has built an extensive acting career, showcasing her range in numerous television dramas, films, and stage productions.
3.2.1. Television Dramas
Kuninaka has starred in many television dramas throughout her career. Her notable roles include:
- L×I×V×E (TBS, 1999) as Keiko Muranishi
- Kokusan Hina Musume (TV Tokyo, 1999)
- Warui Onna "Player" (TBS, 1999) as Mako Akasaka (lead role)
- Shin-D "Natsu no Tsubomi" (Nippon TV, 2000)
- Summer Snow (TBS, 2000) as Misa Suzuki
- Churasan series (NHK General):
- Churasan (2001) as Eri Kohagura (lead role)
- Churasan 2 (2003) as Eri Kohagura (lead role)
- Churasan 3 (2004) as Eri Kohagura (lead role)
- Churasan 4 (2007) as Eri Kohagura (lead role)
- Goban no Tsubaki (NHK General, 2001) as Oshino (lead role)
- Yume no California (TBS, 2002) as Keiko Aso
- Tantei Kazoku (Nippon TV, 2002) as Ako Tanaka
- Tensai Yanagizawa Kyouju no Seikatsu (Fuji TV, 2002) as Setsuko Yanagizawa
- Black Jack ni Yoroshiku (TBS, 2003) as Yasuko Minagawa
- Nama Housou wa Tomaranai! (TV Asahi, 2003) as Izumi Hanano
- Taikou Ki ~Saru to Yobareta Otoko~ (Fuji TV, 2003) as Nene
- Black Jack ni Yoroshiku ~Namida no Gan Byoutou-hen~ (TBS, 2004) as Yasuko Minagawa
- Horobi no Monochrome (Fuji TV, 2004) as Hana Tsukimori (lead role)
- Minna Mukashi wa Kodomo Datta (Kansai TV, 2005) as Aiko Teruzaki (lead role)
- Edomae Sushi Shokunin Kirara no Shigoto (TBS, 2005) as Kirara Kaido (lead role)
- Koi no Karasawagi Drama Special "Warawareru Onna" (Nippon TV, 2005) as Izumi Mito (lead role)
- Brother Beat (TBS, 2005) as Chisato Tamura
- SMAP×SMAP "Happy Valentine ~Ano Hi no Omoi~" (Kansai TV / Fuji TV, 2006) as Takako Tamura
- Senka ~Ginza Hostess Kabu Battle~ (Nippon TV, 2006) as Chihiro Sakamoto (lead role)
- Kekkon Dekinai Otoko (Kansai TV, 2006) as Michiru Tamura
- Chibi Maruko-chan (Fuji TV, 2006) as Young Sumire Sakura
- Akuma ga Kitarite Fue wo Fuku (Fuji TV, 2007) as Mineko Tsubaki
- Nihon Ijin Taishou 2007 "Oichi no Kata" (Fuji TV, 2007) as Oichi no Kata
- Shinuka to Omotta "Okaasan" (Nippon TV, 2007) as Miyuki Wakatsuki (lead role)
- Hoshi Hitotsu no Yoru (Fuji TV, 2007) as Natsu Miyashita
- Hotaru no Hikari (Nippon TV, 2007) as Yuuka Saegusa
- Otoko no Kosodate (Asahi Broadcasting Corporation / TV Asahi, 2007) as Yayoi Mizusawa
- Tokyo Daikushu (Nippon TV, 2008) as Ayako Tomita
- Average "Furin Onna no Shuumatsu" (Fuji TV, 2008) as Yuuko Mitsui
- Kaze no Garden (Fuji TV, 2008) as Kanae Futagami
- Celeb to Binbo Taro (Fuji TV, 2008) as Sachiko Yasuda
- Goro's Bar Drama Special (TBS, 2009) as Kanae Tanokura
- Zettai Kareshi ~Kanzen Muketsu no Koibito Robot~ Saishuushou Special (Fuji TV, 2009) as Ayumi Kamiya
- Kaidoku ~Toshi Densetsu no Angou Mystery~ (Kansai TV, 2009) as Misuzu Hashiba
- ROMES (NHK General, 2009) as Aoi Yasaka
- Warau Joyu "Kokuhaku" (Nippon TV, 2010) as Hitomi Sugimoto
- Sotsuuta / Daini Ya "Michi" (Fuji TV, 2010) as Mariko Yamazaki
- SMAP×SMAP "Hontou ni Atta Koi no Hanashi ~Shougeki no Renai Episode Best 10~" Dai 9 Wa "Propose no Ooi Koi" (Kansai TV / Fuji TV, 2010) as Saori
- Tumbling (TBS, 2010) as Shoko Ezaki
- Special Drama "Strawberry Night" (Fuji TV, 2010) as Rinko Sata
- Jui Dolittle Episode 4 (TBS, 2010) as Eri Tsukino
- Kokuhatsu ~Koksen Bengonin Episode 6 (TV Asahi, 2011) as Yukiko Miyazaki
- Shiawase ni Narou yo (Fuji TV, 2011) as Miyuki Matsushita
- Madonna Verde (NHK General, 2011) as Rie Sonezaki
- Yo nimo Kimyo na Monogatari 21 Seiki 21 Nenme no Tokubetsuhen "PETS" (Fuji TV, 2011) as Momoko Kurita
- Ore no Sora Keijihen (TV Asahi, 2011) as Mayumi Okawa
- Strawberry Night Episode 1 (Fuji TV, 2012) as Rinko Sata (flashback appearance)
- Hungry! (Kansai TV, 2012) as Maria Tachibana
- Nazotoki wa Dinner no Ato de Special (Fuji TV, 2012) as Shoko Hattori
- Morimura Seiichi Onna no Suspense Marriage (Fuji TV, 2012) as Akane Kojima (lead role)
- Ososaki no Himawari ~Boku no Jinsei, Renewal~ (Fuji TV, 2012) as Sayori Shimada
- NHK Shogatsu Jidaigeki O-Yari Haishaku ~Yoidore Kotouji Ryuusho~ (NHK General, 2013) as Okiku
- Shinshun Wide Jidaigeki Byakkotai ~Yaburezaru Monotachi~ (TV Tokyo, 2013) as Misuko Saigo
- Ooka Echizen (NHK BS Premium, 2013, 2014) as Yukie
- Aji Ichimonme (TV Asahi, 2013 Special) as Natsuko Kayama
- Gekiryuu ~Watashi wo Oboeteimasuka?~ (NHK General, 2013) as Takako Midohara
- Getsuyou Mystery Theater Sugimura Saburo Series (TBS) as Naoko Sugimura:
- Namonaki Doku (2013)
- Petero no Soretsu (2014)
- Renzoku Drama W (WOWOW):
- Tengoku no Soup (2008) as Yuko Sugimura (lead role)
- Zouka no Mitsu (2011) as Kanako Ogawa
- Umoreru (2014) as Yoko Asao
- Higashino Keigo "Kataomoi" (2017) as Risako Nishiwaki
- OZU ~Ozu Yasujiro ga Egaita Monogatari~ Dai 2 Wa "Umarete wa Mita Keredo" (2023) as Eiko
- Black President (Kansai TV, 2014) as Mari Saejima
- Date ~Koi to wa Donna Mono Kashira~ (Fuji TV, 2015) as Kaori Shimada
- Date ~Koi to wa Donna Mono Kashira~ 2015 Natsu Hito (Fuji TV, 2015) as Kaori Shimada (voice only)
- Getsuyou Golden "Minkan Kasouken Kirino Mai no Satsujin Kantei" (TBS, 2016) as Mai Kirino (lead role)
- 99.9 - Keiji Senmon Bengoshi - Episode 9 (TBS, 2016) as Satsuki
- Mukashibanashi Houtei "Shitakiri Suzume Saiban" (NHK E Tele, 2016) as Prosecutor
- Shikaku Tantei Higurashi Tabito Episode 3 (Nippon TV, 2017) as Manaka Nishizawa
- Uso no Senso Episode 9 (Kansai TV, 2017) as Yumiko Nanasawa
- Yo nimo Kimyo na Monogatari '18 Aki no Tokubetsuhen "Ashita no Atashi" (Fuji TV, 2018) as Kaori Saiki (lead role)
- Doyo Drama Special Vietnam no Hikari ~Boku ga Musho Iryo wo Hajimeta Riyu~ (NHK, 2019) as Yui Hatori
- Haru ~Sogo Shosha no Onna~ Episode 6 (TV Tokyo, 2019) as Eriko Kubota
- Nichiyo Prime Drama Special Shitto (TV Asahi, 2020) as Fumika Nagai (lead role)
- Kanrikan King (TV Asahi, 2022) as Kaori Nanase
- Kodoku no Gourmet 2023 Omisoka Special Inogashira Goro, Minami e Tohiko "Sagasanai de Kudasai." (TV Tokyo, 2023) as Rena Tamashiro
- Dear Radiance (NHK General, 2024) as Chiyaha (recollection appearances in subsequent episodes)
- Kitchen no Alice Episode 4, 8, Final (Nippon TV, 2024) as Michiko Gojo
- Minami-kun ga Koibito!? Episode 4 - (TV Asahi, 2024) as Sanae Tomita
- 3 Nen C Gumi wa Furin Shitemasu. (Nippon TV, 2024) as Haruka Uemura
3.2.2. Films
Kuninaka has also appeared in several feature films:
- The Man Who Wipes Mirrors (2003) as Mayumi Minagawa
- Densha Otoko (2005) as Rika
- Sono Toki wa Kare ni Yoroshiku (2007) as Misaki Shibata
- HERO (2007) as Megumi Matsumoto
- Kansen Retto (2009) as Takako Mita
- My Darling Is a Foreigner (2010) as Mika
- Aibou Series X DAY (2013) as Mina Aso
- 366 Days (2025) as Akari Tamashiro
3.2.3. Stage Performances
Kuninaka has performed in theatrical productions, taking on significant roles:
- Tenshoin Atsuhime (Hakataza, 2011) as Atsuhime (lead role)
- Yoshimoto Hyakunen Monogatari Taisho to Goryo-san Futari no Yume (Namba Grand Kagetsu, 2012) as Sei Yoshimoto
3.2.4. Other Acting Roles
Beyond traditional dramas and films, Kuninaka has engaged in various other acting and media roles.
- Educational Programs**: She appeared as herself in Vocaburider on TV on NHK E Tele from September to October 2016, and again from April 2017.
- Variety Shows**: She was a regular on Idol High School Geino Jogakkan (Fuji TV, 1998-1999), Music Jump (NHK-BS2, 1999-2000), and BEAT BANG (TV Tokyo, 1999-2000). She also co-hosted the 33rd Omoide no Melody (NHK General / Radio 1, 2001) and served as a reporter for Sekai Bikkuri Ryokosha (NHK General, 2010).
- Voice Acting and Narration**: Kuninaka has lent her voice to documentaries and special programs. She was a reporter for Canon Special Hikari no Wakusei 5000 Nen no Tabi (TV Asahi, 2004) and a personality for Science Mystery Sore wa Unmei ka Kiseki ka!? (Fuji TV, 2004). She provided narration for Miyazato Ai 19 Sai no Mirai Chizu (Fuji TV, 2004), Higashi no Taiyo Nishi no Tsuki Hoshi (BS Asahi, 2007), and Okinawa no Kaze, Futatabi (MBS, 2008). She was also the narrator for Nippon Kiko (NHK General, 2008), Kiseki no Chikyu Monogatari (TV Asahi, 2010), Taikan! Great Nature (NHK BS Premium, 2011), Athlete no Tamashii (NHK General, 2011), and Europe Shokudo (BS Asahi, 2013). More recently, she narrated Fushigi no Shurijo (NHK General, 2020) and Senjo ni Kieta Jumin (NHK BS1, 2021).
- Navigator Roles**: She served as a navigator for travel and cultural programs such as Kuninaka Ryoko no Italy Bishoku Kiko (BS Asahi, 2014), Kuninaka Ryoko no France Bishoku Kiko (BS Asahi, 2015), and Kuninaka Ryoko ga Tadoru Ryukyu no Ishi (Ryukyu Broadcasting / TBS, 2015).
- Mobile Dramas**: She appeared in mobile dramas distributed via VISION CAST, including Ichikabachika (2007) as Ryoko, FIVE STORIES in IKSPIARI "Piman kara no Request" (2007) as Sonoka Sakurai, and Fuwafuwa Fuwari (2008) as Ryoko.
3.3. Singing Career
Ryōko Kuninaka embarked on a singing career in addition to her acting work.

Her debut single, "Ryukyu Moon", was released on April 25, 2003, and served as the theme song for the drama "Churasan 2." She followed this with her second single, "Meguri Aeta ne," released on September 29, 2004, which was the theme song for "Churasan 3." Her first album, "Furusato" (ふるさとFurusatoJapanese, meaning "Hometown"), was released on February 18, 2004. In November 2004, she also released a music video collection on DVD titled "Oto Keshiki" (音景色Oto KeshikiJapanese, meaning "Sound Scenery").
3.4. Other Media Activities
Kuninaka's presence extends to other media forms, including radio and numerous commercial endorsements.
Her radio engagements include being a regular on the FM-FUJI program "JUNGLE PARADISE" in 1999.
She has been featured in a wide array of television commercials for various brands:
- Nivea Kao: "8x4" (1999), "Atrix" (2006)
- Nissin Foods: "Men Shokunin" (2001)
- Energy Conservation Center: "Smart Life" (2001-2002)
- JR East: "Suica" (2001-2002)
- Toyota: "Toyota Service" (2002)
- NTT Communications: "CoDen" (2003)
- Kirin Beverage: "Ryukyu Go" (2003)
- Toshiba: "Non-Freon The Senzokko" (2003)
- Calbee: "Potato Chips" (2004)
- Ajinomoto: "Ajinomoto KK no Kihon Dashi" (2005-2008)
- Lion: "Smile Contact Pure" (2005)
- Alico Japan (2006-2008)
- Yamada Bee Farm: "Honey Lab Skin Care" (2009)
- Takeda Pharmaceutical: "Benza Block IP Plus" (2013)
- Just: "Water Stand" (2017)
4. Personal Life
Ryōko Kuninaka's personal life has seen significant milestones, particularly her marriage and family.
4.1. Family and Marriage
On November 21, 2014, it was reported by Sports Nippon that Ryōko Kuninaka was planning to marry actor Osamu Mukai in December of the same year. The couple had co-starred in the Kansai Television drama "Hungry!" They officially submitted their marriage registration on December 28, 2014, a day considered auspicious in the Japanese calendar.
On April 20, 2015, Kuninaka announced her first pregnancy. She gave birth to a baby boy on September 30, 2015, a fact announced via her agency's official website, though the specific birth date was not disclosed. She returned to work in June 2016, making her comeback appearance in episode 9 of the TBS drama "99.9 - Keiji Senmon Bengoshi -". On September 25, 2017, she announced her second pregnancy. She gave birth to her second child in 2018 and subsequently returned to work in November 2018, starring in "Ashita no Atashi," an episode of Fuji TV's "Yo nimo Kimyo na Monogatari '18 Aki no Tokubetsuhen."
4.2. Personal Relationships and Reputation
Kuninaka is known for her close friendships within the entertainment industry and has maintained a positive public image.
She shares a close friendship with singer Hitomi Shimatani, with both referring to each other as best friends. They have co-starred in television productions, including episode 8 of the 2002 Nippon TV drama "Tantei Kazoku" and the variety show "Buruburu Untouchable" on TV Asahi, which aired on October 12, 2007.
Kuninaka also developed a deep bond with actress Yoshiko Tanaka after co-starring in "Churasan." Kuninaka regarded Tanaka as a "mother" figure in Tokyo, and they shared trips together, including a visit to South Korea. They also appeared together in a special episode of "Mori no Sasayaki" (Fuji TV, Tanaka was a regular narrator), where they visited Oze on July 31, 2010. In their personal lives, mirroring their drama roles, Tanaka affectionately called Kuninaka "Eri," and Kuninaka referred to Tanaka as "Mother." Following Tanaka's death from breast cancer on April 21, 2011, Kuninaka tearfully expressed her grief at the wake on April 24, stating, "I received so much from her, but I couldn't do anything for her. I will always remember her calling me 'Eri' in her lovely voice."
She also maintains a close friendship with SHEILA, whom she co-starred with in "Kekkon Dekinai Otoko" (Kansai TV). They frequently travel together, and Kuninaka affectionately calls SHEILA "Shei-nee."
In terms of public perception, Kuninaka's portrayal of the heroine in "Churasan" left a lasting impression. In a "Memorable Asa Drama Heroine" poll conducted by the Asahi Shimbun and published on September 25, 2010, Kuninaka ranked third. She was preceded only by Fumie Kashiyama (for "Ohanahan") and Yuko Tanaka (for "Oshin"), highlighting the significant impact of her role and her positive reception among the public. Kuninaka stands at a height of 62 in (158 cm) and has a B blood type.
5. Awards and Nominations
Ryōko Kuninaka has received several awards and nominations throughout her career, primarily for her acting performances.
Year | Award | Category | Work(s) | Result |
---|---|---|---|---|
2001 | 30th Television Drama Academy Awards | Best Actress | Churasan | Won |
2001 | 9th Best Smile of the Year | - | Herself | Won |
2002 | 26th Elan d'or Awards | Newcomer of the Year | Herself | Won |
2002 | 39th Golden Arrow Awards | Broadcast Newcomer Award | Herself | Won |
2002 | 27th Bulgaria Golden Chest International TV Festival | Best Actress | Goban no Tsubaki | Won |
6. Works and Releases
Beyond her acting and singing discography, Ryōko Kuninaka has released several photo books and other media.
- Photo Books**:
- Sugao no Mama de. (素顔のままで。Sugao no Mama de.Japanese, "As I Am.") (October 1999, T.I.S., photographed by Seiichi Nomura)
- 23ans (July 2002, Wani Books, photographed by Yoshinobu Nemoto)
- Kuninaka Ryoko Shashinkan ~Kaze no Kioku~ (国仲涼子写真館~風の記憶~Kuninaka Ryōko Shashinkan ~Kaze no Kioku~Japanese, "Ryoko Kuninaka Photo Gallery ~Memories of Wind~") (March 26, 2004, Shufu to Seikatsusha, photographed by Takashige Tsutsumi)
- COLORS (July 27, 2011, Wani Books, photographed by Yoshinobu Nemoto)
- Music DVDs**:
- Oto Keshiki (音景色Oto KeshikiJapanese, "Sound Scenery") (November 2004, Pony Canyon) - A collection of her music videos.