Sekaiichi Happy na Onna no Ko (世界一HAPPYな女の子; World's Happiest Girl) is the seventeenth major label single released by ℃-ute. The single was released on September 7, 2011 and the Single V on September 14, 2011.

The single reached #6 on the Oricon charts and charted for three weeks, selling 19,830 copies, becoming their lowest selling single yet.

Contents 1 Tracklist 1.1 CD 1.2 Limited Edition A DVD 1.3 Limited Edition B DVD 1.4 Single V 1.5 Event V 2 Featured Members 3 Concert Performances 4 Song Information 5 Oricon Chart Positions 6 External Links 7 Comments

TracklistEdit

CDEdit

1. Sekaiichi Happy na Onna no Ko
2. Idai na Chikara wo! (偉大な力を！; Great Power!)
3. Sekaiichi Happy na Onna no ko (Instrumental)

Limited Edition A DVDEdit

1. Sekaiichi Happy na Onna no Ko (Dance Shot Ver.)

Limited Edition B DVDEdit

1. Sekaiichi Happy na Onna no Ko (Color Box Ver.)

Single VEdit

1. Sekaiichi Happy na Onna no Ko (PV)
2. Sekaiichi Happy na Onna no Ko (Close-up Ver.)
3. Making of (メイキング映像)

Event VEdit

1. Sekaiichi HAPPY na Onna no Ko (Yajima Maimi Solo Ver.)
2. Sekaiichi HAPPY na Onna no Ko (Nakajima Saki Solo Ver.)
3. Sekaiichi HAPPY na Onna no Ko (Suzuki Airi Solo Ver.)
4. Sekaiichi HAPPY na Onna no Ko (Okai Chisato Solo Ver.)
5. Sekaiichi HAPPY na Onna no Ko (Hagiwara Mai Solo Ver.)

Featured MembersEdit

• Yajima Maimi
• Nakajima Saki
• Suzuki Airi
• Okai Chisato
• Hagiwara Mai

Concert PerformancesEdit

1. Sekaiichi HAPPY na Onna no Ko
   • Hello! Project 2011 SUMMER ~Nippon no Mirai wa WOW WOW Live~
   • Hello! Project 2011 SUMMER ~Nippon no Mirai wa YEAH YEAH Live~
   • Cutie Circuit 2011 ~9gatsu 10ka wa ℃-ute no Hi~
   • Berryz Koubou & ℃-ute Collaboration Concert Tour 2011 Autumn ~BeriKyuu Island~
   • Hello! Project ☆ Festival 2011
   • Hello! Project 2012 WINTER Hello☆Pro Tengoku ~Rock-chan~
   • Yajima Maimi & Suzuki Airi Acoustic Live at Yokohama BLITZ
   • ℃-ute Concert Tour Spring – Summer 2012 ~Utsukushikutte Gomen ne~
   • Hello! Project Tanjou 15 Shuunen Kinen Live 2012 Natsu ~Ktkr Natsu no FAN Matsuri!~ ℃-ute, Fukumura Mizuki, Takeuchi Akari, Katsuta Rina, Kudo Haruka, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Nakanishi Kana, Tamura Meimi, Iikubo Haruna, Ishida Ayumi, Sato Masaki
   • ℃-ute Concert Tour 2012 Winter ~Shinseinaru Pentagram~
   • Hello! Project Haru no Dai Kansha Hinamatsuri Festival 2013 ~Festival's Eve~
   • Hello! Pro Kenshuusei Happyoukai 2013 ~3gatsu no Nama Tamago Show!~ - Kaneko Rie, Tanabe Nanami, Yoshihashi Kurumi, Ogawa Rena, Murota Mizuki
2. Idai na Chikara wo!
   • Berryz Koubou & ℃-ute Collaboration Concert Tour 2011 Autumn ~BeriKyuu Island~

Song InformationEdit

1. Sekaiichi HAPPY na Onna no Ko
   • Lyrics & Composition: Tsunku
   • Arrangement, Programming, Guitar, and Bass: Takumi Masanori
   • Chorus: CHINO & Okai Chisato
2. Idai na Chikawa wo!
   • Lyrics & Composition: Tsunku
   • Arrangement, Programming, and Guitar: Fujisawa Yoshiaki
   • Chorus: CHINO & Tsunku

Oricon Chart PositionsEdit

Mon	Tue	Wed	Thu	Fri	Sat	Sun	Week Rank	Sales
-	5	10	10	16	12	6	6	16,638
11	29	31	27	24	23	36	25	2,679
32	-	-	-	-	-	-	142	513

Total Reported Sales: 19,830

External LinksEdit

• Hello! Project fiscography entry
• Hello! Project discography entry (Single V)
• Lyrics: Sekaiichi HAPPY Onna no Ko, Idai na Chikara wo!