
Photo: Threjoh · CC BY-SA 4.0 · credits
Yukiko Iwai
Person · female · Japan · Yokohama · born 1968 · recording since 1987
Japanese former pop singer
Also known as 岩井由紀子 · Iwai Yukiko · Yukiko Iwai · Yuuyu · いわい ゆきこ · ゆうゆ · +3 more
Timeline
1960s
1980s
· Debut release
Debut release: 天使のボディーガード
First documented Single in the MusicBrainz discography.
source: musicbrainz
Biography
Biography
Yukiko Iwai (岩井 由紀子, Iwai Yukiko), also known by the nickname Yūyu (ゆうゆ, Yūyu), is a Japanese singer and actress born 26 May 1968 in Yokohama, Kanagawa Prefecture, Japan. Iwai was a member of the all-girl pop group Onyanko Club (from 21 June 1985 until 31 August 1987), and she was the shortest of all the members at 150 centimetres (4 ft 11 in). She was also half of the pop group Ushiroyubi Sasaregumi, a spin-off group of Onyanko Club. She graduated from Kaetsu Women's Junior High and High School (嘉悦女子高校) (now Kaetsu Ariake Junior High and High School), but left Kaetsu Women's Junior College (嘉悦女子短大) (now Kaetsu University Junior College) before she finished. She has an older sister, Akiko, who is four years older than her and is said to look just like her.
Biography
She moved to Funabashi, Chiba Prefecture after her parents divorced when she was younger. She made her media debut in 1985 as a gravure model in Model Graphix (モデルグラフィックス), a magazine for which her older sister was on the editorial committee.
On 21 June 1985, she became the 19th member of Onyanko Club after auditioning on the TV program Yūyake Nyan Nyan, and she appeared on the cover of their first album, Kick Off. Shortly afterward, she and Mamiko Takai, also a member of Onyanko Club, formed the group Ushiroyubi Sasaregumi. She has been called by the nickname "Yūyu" since she was a little girl, and she was also called by that name on the program. Yukiko Iwai performed the lead vocals for Onyanko Club's fifth single, Osaki ni Shitsurei, released in July 1986. From that point, she became the main vocalist for the majority of their albums, and was considered central to the success of the group.
She made her solo debut with the single Angel Bodyguard(天使のボディーガード, Tenshi no Bodīgādo) on 25 March 1987. In April of that same year, Ushiroyubi Sasaregumi was disbanded because Takai graduated from Onyanko Club and moved on to other things. It was said that she and Takai did not get along, which she subsequently admitted on a TV program. Iwai felt that Takai was privileged by Yasushi Akimoto, a lyricist and broadcast writer at the time, which was also not amusing to her. The person she was closest to in Onyanko Club was Minayo Watanabe, who was a year younger than her, and Iwai claimed that unlike the other members, she treated even the younger members as equals. Onyanko Club itself disbanded in August later that year, and Iwai began working for Watanabe Productions (Nabe Pro) along with fellow Onyanko Club member Sonoko Kawai. She also began working under her nickname "Yūyu", turning it into a stage name.
Immediately after Yukiko Iwai turned solo, it became a "winter era of idols" in a reaction to the boom of Onyanko Club, and she retired from singer activity with Peter Pan Again (もう一度ピーターパン, Mōichido Pītā Pan) issued in February 1989. Since then, she has appeared in variety shows such as Quiz! Age Difference Doesn't Matter (クイズ!年の差なんて) and played an active role as an image character of the game software company Taito. In 1994, she changed her stage name back to her real name "Yukiko Iwai", but by this time her activity was sluggish.
In 1997, she married a businessman after she split with entertainer Hideyuki Nakayama, with whom she had been dating for many years. At this time, she refused to hold a press conference with the media, saying she had nothing else to say. Then, she virtually retired from the entertainment industry. Note that she expressed her admiration for DINK after Takai's marriage and stated that she loathed children. However, she had two children after her marriage. In 2002, she participated in the reunion event of Onyanko Club. Since then, however, she has not been seen in public.
Appearance on TV
Variety shows
Sing! Idol Dome (歌え!アイドルどーむ) (from October 1987 to September 1988)
Quiz! Age Difference Doesn't Matter (クイズ!年の差なんて) (from October 1988 to September 1994)
Anime
High School! Kimengumi (from October 1985 to September 1987)
As the spin-off group Ushiroyubi Sasaregumi.
The Adventures of Peter Pan (from January 1989 to December 1989)
As the singer of theme songs.
Videos
ゆうゆファーストコンサート ボクらは元気なゆうゆ印 [Yūyu First Concert We're the energetic Yūyu faction] (Videotape) (in Japanese). Tokyo, Japan: Pony Canyon. 1 March 1988. ASIN B011HMAAJ0.
ボンジョールノ! ゆうゆ イタリア・パック・ツアー [Buon giorno! Yūyu Italian pack tour] (Videotape) (in Japanese). Tokyo, Japan: Pony Canyon. 10 August 1987.
Video games
Yūyu no Quiz de Go! Go! (Taito arcade game released in 1991, ported for the Super Famicom in 1992)
Discography & profile
Normalised profile
Percentiles are computed over every artist in the database, so a tier-3 artist can still sit in the 95th percentile on a single axis.
| Metric | Value | Percentile |
|---|---|---|
| Wikipedia language versions | 8 | 49.7th |
| Spotify monthly listeners | — | no data |
| Release groups in DB | 15 | 85th |
| Studio albums | 4 | 82.8th |
| Awards recorded | 0 | 0th |
| Timeline events | 6 | 80.8th |
| Recording span (years) | 20 | 45.6th |
| Genres | 4 | 84.7th |
Percentiles are computed at render time; missing values mean the artist has no data on that axis.
Discography (15 release groups · 4 studio albums)
Albums · 4
1987 · studio album
Search SpotifySearch YouTube Music
Tracklist · 10 tracks · 37:53
1天使のボディーガード3:502夢見るチャンネル3:223秘密のクロール3:544アッというMAにMEっ! (LPバージョン)3:235はてなが咲いた3:376モナリザのいたずら4:097あんちょこ抜きのラブソング3:388夏のダリア3:579-3℃ (LPバージョン)3:5710時計じかけの片想い4:061987 · studio album
Search SpotifySearch YouTube Music
Tracklist · 10 tracks · 39:52
1ハートブレイクはお早めに4:082へへへのへ3:593アラジンの魔法ビン3:464黄昏のラインダンス3:495メトロポリス・ハネムーン3:42625セントの満月4:187せつないわけの朝寝坊3:408お待ちかねのAカップ3:559Panic’n Roll3:3810マグネット・マジック4:571988 · studio album
Search SpotifySearch YouTube Music
Tracklist · 9 tracks · 34:03
1ついて行けない −がんばれボーイフレンド−3:202TANSAN3:403ドラマチックにいちぬけた3:544左胸あたり3:495YES/24:286サイケデリックレイン3:467見てしまった4:128爪を噛んでた4:469ゆうゆアドリブソング2:081988 · studio album
Search SpotifySearch YouTube Music
Tracklist · 10 tracks · 40:02
1ロイヤルストレートクラッシュ3:322渚のリボン4:28310月75日3:444あ・うんの微笑み3:445戸惑いリグレット4:036涙にエクボ4:197夜空のメニュー4:348チャッカリ ブギ3:429ロマンティックマーケット3:3510サヨナラ志願4:21
Single · 8
| Cover | Year | Title | Notes | First release |
|---|---|---|---|---|
| 1987 | 天使のボディーガードSearch SpotifySearch YouTube MusicTracklist · 2 tracks · 8:00A天使のボディーガード3:51 Bモナリザのいたずら4:09 | 25 March 1987 | ||
| 1987 | -3°CSearch SpotifySearch YouTube MusicTracklist · 2 tracksA-3°C BアッというMAにMEっ! | 22 July 1987 | ||
| 1987 | 25セントの満月Search SpotifySearch YouTube MusicTracklist · 2 tracks · 8:13A25セントの満月4:18 Bお待ちかねのAカップ3:55 | 28 October 1987 | ||
| 1988 | ついて行けない –がんばれボーイフレンド–Search SpotifySearch YouTube MusicTracklist · 2 tracks · 8:06Aついて行けない –がんばれボーイフレンド–3:20 B爪を噛んでた4:46 | 21 January 1988 | ||
| 1988 | 左胸あたりSearch SpotifySearch YouTube MusicTracklist · 2 tracks · 8:011左胸あたり3:49 2見てしまった4:12 | 21 April 1988 | ||
| 1988 | サヨナラ志願Search SpotifySearch YouTube MusicTracklist · 2 tracks · 8:241サヨナラ志願4:21 2戸惑いリグレット4:03 | 27 July 1988 | ||
| 1988 | 星空のギャングスターSearch SpotifySearch YouTube MusicTracklist · 2 tracks · 7:551星空のギャングスター4:11 2あ・うんの微笑み3:44 | 30 November 1988 | ||
| 1989 | もう一度ピーターパンSearch SpotifySearch YouTube MusicTracklist · 2 tracks · 9:061もう一度ピーターパン4:39 2夢よ開けゴマ!4:27 | 8 February 1989 |
Album · 3
| Cover | Year | Title | Notes | First release |
|---|---|---|---|---|
| 1987 | 僕としては高井麻巳子に夢中なわけで、ゆうゆがこれまたかわいくて、そう考えるとうしろゆびさされ組ってのはやっぱりすごかったんだなあと思う今日このごろではあります。Search SpotifySearch YouTube MusicTracklist · 12 tracks · 43:511かしこ4:11 2うそつき3:47 3天使のボディーガード3:51 4約束4:44 5-3℃ 6バナナの涙3:51 725セントの満月4:18 8かげろう3:53 9はてなが咲いた3:37 10猫舌ごころも恋のうち3:14 11シンデレラたちへの伝言4:01 12うしろゆびさされ組4:24 | Compilation | 21 November 1987 | |
| 2002 | ゆうゆベストSearch SpotifySearch YouTube MusicTracklist · 16 tracks · 1:05:141天使のボディーガード3:49 2-3℃3:58 325セントの満月4:18 4ついて行けない 〜がんばれボーイフレンド〜3:22 5左胸あたり3:50 6サヨナラ志願4:24 7星空のギャングスター4:13 8もう一度ピーターパン4:38 9夢よ開けゴマ!4:25 10あ・うんの微笑み3:45 11戸惑いリグレット4:05 12見てしまった4:13 13爪を噛んでた4:46 14お待ちかねのAカップ3:57 15アッというMAにMEっ!3:25 16モナリザのいたずら4:06 | Compilation | 20 February 2002 | |
| 2007 | ゆうゆ SINGLES コンプリートSearch SpotifySearch YouTube MusicTracklist · 17 tracks · 57:451天使のボディーガード3:51 2モナリザのいたずら4:09 3-3℃ 4アッというMAにMEっ! 525セントの満月4:18 6お待ちかねのAカップ3:55 7ついて行けない -がんばれボーイフレンド-3:20 8爪を噛んでた4:46 9左胸あたり3:49 10見てしまった4:12 11サヨナラ志願4:21 12戸惑いリグレット4:03 13星空のギャングスター4:11 14あ・うんの微笑み3:44 15もう一度ピーターパン4:39 16夢よ開けゴマ!4:27 17サヨナラの前に接吻を | Compilation | 17 August 2007 |
Stats & PK
Percentile within all 23,672 published artists.Put Yukiko Iwai head-to-head →
| Metric | Value | Percentile |
|---|---|---|
| Wikipedia language versions | 8 | 49.7th |
| Spotify monthly listeners | — | no data |
| Release groups in DB | 15 | 85th |
| Studio albums | 4 | 82.8th |
| Awards recorded | 0 | 0th |
| Timeline events | 6 | 80.8th |
| Recording span (years) | 20 | 45.6th |
| Genres | 4 | 84.7th |
Awards & honours
Line-up
| Name | From | To | Role |
|---|---|---|---|
| シスターラビッツ(band) | 21 June 1985 | 20 September 1987 | |
| シスターラビッツ(band) | 30 September 1985 | 5 April 1987 |
Where this record comes from
portrait—Wikimedia Commons · CC BY-SA 4.0 · retrieved 11 October 2026
https://commons.wikimedia.org/wiki/File:Yuyu_en_mayo_de_1993.jpgaliases/urls—musicbrainz · CC0 · retrieved 10 October 2026
https://musicbrainz.org/artist/9e21d16e-c5fc-4a1b-80bb-c72dd28caca9discography—musicbrainz · CC0 · retrieved 10 October 2026
https://musicbrainz.org/artist/9e21d16e-c5fc-4a1b-80bb-c72dd28caca9core—wikidata · CC0 · retrieved 10 October 2026
https://www.wikidata.org/wiki/Q3573158genre—wikidata · CC0 · retrieved 11 October 2026
https://www.wikidata.org/wiki/Q3573158seed-list—wikipedia · CC BY-SA 4.0 · retrieved 10 October 2026
https://en.wikipedia.org/wiki/Yukiko_Iwai_%28singer%29biography—wikipedia-en · CC BY-SA 4.0 · retrieved 10 October 2026
https://en.wikipedia.org/wiki/Yukiko_Iwai_%28singer%29
Why this artist is in the database
- List of Japanese singers
Tier rule: curated genre/region list
Image: Threjoh · CC BY-SA 4.0 · Wikimedia Commons
Wikidata: Q3573158 · MusicBrainz: 9e21d16e-c5fc-4a1b-80bb-c72dd28caca9
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