"Mondai Girl" (もんだいガール, Mondai Gāru, lit. "Problem Girl") is the tenth physical single by Japanese singer Kyary Pamyu Pamyu, released on March 18, 2015. Released in both CD and digital editions, the single contains the A-side song "Mondai Girl" along with three B-side tracks. The single's title is a pun, coming from the phrase "mondai ga aru", literally "there is a problem".

"Mondai Girl" is used as the theme song for the Fuji Television drama series A Restaurant With Many Problems. The other tracks, "My Room" and "KISEKAE" are used in the CHINTAI room rental service and the New Nintendo 3DS commercials respectively.

This is Kyary's first release in nine months following her June 2014 release Kira Kira Killer. In the meantime, Kyary went on two arena tours and released her 3rd studio album Pika Pika Fantajin. During one of her arena tours entitled "Kyary Pamyu Pamyu Colorful Panic Toy Box" She revealed at the last stop of the arena tour that she had been experiencing the darker side of fame saying that her privacy had been invaded and she simply had enough.

The first song, "My Room" was revealed in a commercial for CHINTAI room rental app service. The second song, "KISEKAE" was first revealed at the commercial for the New Nintendo 3DS before the handheld's launch at October 11, 2014, It was soon followed by a Christmas version in December 2014. In the same month, Kyary announced the next single's title and will serve as a theme song for the TV drama A Restaurant with Many Problems, which aired on January 15, 2015. Both KISEKAE and My Room are included as B-side tracks. Also included is a remix version of Kyary's 2012 single Candy Candy.

All tracks written by Yasutaka Nakata.

Steve Nakamura – Art Director, Designer

Shinji Konishi – Hair & Makeup

Kumiko Iijima – Stylist

The music video describes the concept of "strong woman" in three different worlds, in accordance with the kanji quadrigram "三者三様”, which translates literally to "three people three styles" and means "everyone's different, to each his own". The first character in the video is Kyary in a completely pink outfit, as a young actress chased by paparazzi. The second one is a Kyary wild and free, dancing however she wants with foreign dancers. The third character, clad in all manners of black clothes, is Kyary fighting in a majestic animated world. Several scenes show Kyary and her problems, all in typical Kyary humour. The doll she is holding is similar in style to characters by famous Japanese artist Takashi Murakami.

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