Houkago Princess (also known as HouPri for short) debuted in August 2011 with their first Indies single, titled Houkago Princess ~Oshiete Kudasai~ with the concept of being ‘Idols that you can dress up’. They currently have their own theatre in Ikebukuro called ‘Ikebukuro White Base’, where they hold performances wearing the costumes that their fans choose.
On December 10th, 2011, Houkago Princess had their first major change in their line-up with the graduation of 1st generation member, Yamaguchi Mai. The group then introduced two new members, Aoi Nagafuji and Rena Kobayashi.
Houkago Princess were originally a group that consisted of 8 members before their official Indies debut. However, one of the original members left the group before their first single could be released, thus creating the 7-nin lineup of Houkago Princess.
On December 10th, 2011, Houkago Princess member Yamaguchi Mai graduated from the group with the graduation concert ~A Sports Festival – Though this is also a Graduation Ceremony~ where she left the group to pursue other things.