Otona ni Narutte Muzukashii!!!

thumb|220px|right|Otona ni Narutte Muzukashii!!! (MV) Otona ni Narutte Muzukashii!!! (オトナになるって難しい!!!; Becoming an Adult is Difficult!!!) is the 4th and last indie single by S/mileage. The single was released on March 14, 2010. The Single V was released in April 3, 2010. It is also the ending theme to the anime ''Hime Chen! Otogi Chikku Idol Lilpri,'' which Maeda Yuuka, Wada Ayaka, and Fukuda Kanon voice characters in.

CD

 * 1) Otona ni Narutte Muzukashii!!!
 * 2) Otona ni Narutte Muzukashii!!! (Instrumental)

Single V

 * 1) Otona ni Narutte Muzukashii!!! (MUSIC CLIP)
 * 2) Making of (メイキング映像)

Featured Members

 * Wada Ayaka
 * Maeda Yuuka
 * Fukuda Kanon
 * Ogawa Saki

Concert Performances

 * 1) Otona ni Narutte Muzukashii!!!
 * 2) *Hello! Project 2010 Winter Kachou Fuugetsu ~Mobekimasu!~
 * 3) *2010nen Hello! Pro Egg Norimen Live 2gatsu
 * 4) *Special Joint 2010 Haru ~Kansha Mankai! Mano Erina 2 Shuunen Totsunyuu & *S/mileage Major Debut e Sakura Sake! Live~
 * 5) *Hello! Project 2010 Summer ~Fankora!~
 * 6) *S/mileage 1st Live Tour 2010 Aki ~Devil Smile Angel Smile~
 * 7) *S/mileage Concert Tour 2011 Aki ~Gyakushuu no Mini Skirt~

Song Information

 * Lyrics, Music, & Chorus: Tsunku
 * Arrangement, Programming, & Guitar: Itagaki Yusuke
 * Vocals:
 * Maeda Yuuka (Main Vocals)
 * Fukuda Kanon, Ogawa Saki (Minor Vocals)

Trivia

 * This is the only S/mileage indie single that was released under the Up-Front Works label.

Oricon Chart Positions
Total Reported Sales: 2,290