Sekaiichi Happy na Onna no Ko

"Sekaiichi Happy na Onna no Ko" (世界一HAPPYな女の子; "The happiest girl in the world") is the 17th major single by the Japanese idol group Cute, released in Japan on September 7, 2011^[1][2] on the Zetima label.^[3]

"Sekaiichi Happy na Onna no Ko"
Regular Edition cover
Single by Cute
from the album Dai Nana Shō 'Utsukushikutte Gomen ne'
B-side	"Idai na Chikara o!"
Released	September 7, 2011 (2011-09-07) (Japan)
Genre	J-pop
Length	13:38
Label	Zetima
Songwriter(s)	Tsunku
Producer(s)	Tsunku
Cute singles chronology
"Momoiro Sparkling" (2011) "Sekaiichi Happy na Onna no Ko" (2011) "Kimi wa Jitensha Watashi wa Densha de Kitaku" (2012)
Berryz Kobo×Cute singles chronology
"Amazuppai Haru ni Sakura Saku" (2011)
Hello! Project Mobekimasu singles chronology
"Busu ni Naranai Tetsugaku" (2011)
Music video
"Sekaiichi Happy na Onna no Ko" on YouTube

Background

The single will be released in three versions: Regular Edition (catalog number EPCE-5816), and Limited Editions A (EPCE-5812/3) and B (EPCE-5814/5) that include a bonus DVD. Limited Edition A DVD will contain the "Sekaiichi Happy na Onna no Ko (Dance Shot Ver.)" music video, and Limited Edition B will have "Sekaiichi Happy na Onna no Ko (Color Box Ver.)".

The Single V will be released on September 14.

CD single

Track listing

All tracks are written by Tsunku.

CD

No.	Title	Arrangement	Length
1.	"Sekaiichi Happy na Onna no Ko" (世界一ＨＡＰＰＹな女の子)	Masanori Takumi	4:23
2.	"Idai na Chikara o!" (偉大な力を！)	Yoshiaki Fujisawa	4:44
3.	"Sekaiichi Happy na Onna no Ko (Instrumental)" (世界一ＨＡＰＰＹな女の子(Instrumental))		4:23

Limited Edition A DVD

No.	Title	Length
1.	"Sekaiichi Happy na Onna no Ko (Dance Shot Ver.)" (世界一ＨＡＰＰＹな女の子(Dance Shot Ver.))

Limited Edition B DVD

No.	Title	Length
1.	"Sekaiichi Happy na Onna no Ko (Color Box Ver.)" (世界一ＨＡＰＰＹな女の子(Color Box Ver.))

Bonus

Sealed into all the limited editions

• Event ticket lottery card with a serial number

Single V

DVD

No.	Title	Length
1.	"Sekaiichi Happy na Onna no Ko" (世界一ＨＡＰＰＹな女の子)
2.	"Sekaiichi Happy na Onna no Ko (Close-up Ver.)" (世界一ＨＡＰＰＹな女の子(Close-up Ver.))
3.	"Making of" (メイキング映像 Making eizō)

Event V

DVD

No.	Title	Length
1.	"Sekaiichi Happy na Onna no Ko (Maimi Yajima Solo Ver.)" (世界一ＨＡＰＰＹな女の子(Maimi Yajima Solo Ver.))
2.	"Sekaiichi Happy na Onna no Ko (Saki Nakajima Solo Ver.)" (世界一ＨＡＰＰＹな女の子(Saki Nakajima Solo Ver.))
3.	"Sekaiichi Happy na Onna no Ko (Airi Suzuki Solo Ver.)" (世界一ＨＡＰＰＹな女の子(Airi Suzuki Solo Ver.))
4.	"Sekaiichi Happy na Onna no Ko (Chisato Okai Solo Ver.)" (世界一ＨＡＰＰＹな女の子(Chisato Okai Solo Ver.))
5.	"Sekaiichi Happy na Onna no Ko (Mai Hagiwara Solo Ver.)" (世界一ＨＡＰＰＹな女の子(Mai Hagiwara Solo Ver.))

Charts

Chart (2011)	Peak position
Oricon Daily Singles Chart	5
Oricon Weekly Singles Chart[3]	6
Oricon Monthly Singles Chart	24
Billboard Japan Hot 100[4]	27
Billboard Japan Hot Singles Sales[5]	7
Billboard Japan Adult Contemporary Airplay[6]	74

Sales and certifications

	First week	Total
Oricon sales	16,638[7]	19,830