Iikubo Haruna, born November 7, 1994 in Tokyo, Japan, is a 10th generation memeber of Morning Musume. She is also a fashion model and actress. She is a former model for the Japanese fashion magazine Love Berry.
In 2009, Haruna won a special award at the exclusive auditions for the fashion magazine Love Berry. She first appeared as a model in the June number of the magazine. Since the July issue, Haruna Iikubo adopted the stage name Hau Dan (壇 はう). She "graduated" from Love Berry (left the project) in the February 2011 number.
Iikubo Haruna was selected from Morning Musume's 10th Generation audition to join the group on September 29, 2011, along with Ishida Ayumi, Satou Masaki, and former Hello! Pro Egg Kudo Haruka.
The 10th generation made their official presentation on the same day they were announced as new members in the "Morning Musume Concert Tour Fall 2011 Ai Believe ~Takahashi Ai Graduation Memory Special~" concert, and they participated in a performance of the song "Tomo". They also participated in the end of the song "Namidacchi".
(Source: Hello! Project Wiki)