Hanasakigawa Girls' High School

, or Hanajo for short, is the school of the members of Poppin'Party, most of the Hello, Happy World! members, MyGO!!!!! member Shiina Taki, and many members of other bands.

It has a high school as well as a middle school branch.

Uniforms
The standard and winter version of the Hanasakigawa Girls' High uniform consists of a beige long sleeved dress with gold buttons with a strap like belt, along with a sailor style collar and a red ribbon.

In the summer, the uniforms change to a light blue short sleeved shirt, adorned with a white pleated skirt with a blue lining near the edges, along with a blue ribbon.

Unknown class

 * Shiina Taki
 * Yahata Umiri

Unknown Class

 * Charlotte Louise Misono

Class 3-A

 * Toyama Kasumi
 * Ichigaya Arisa
 * Yamabuki Saaya

Class 3-B

 * Hanazono Tae
 * Ushigome Rimi
 * Wakamiya Eve

Class 3-E

 * Tsurumaki Kokoro
 * Kitazawa Hagumi
 * Okusawa Misaki

Unknown class

 * Umino Natsuki
 * Taiko Satomi

Alumnae

 * Nijikki Hinako
 * Toyama Asuka (Transferred to Haneoka Girls' High School)
 * Ushigome Yuri
 * Uzawa Rii
 * Wanibe Nanana
 * Hikawa Sayo
 * Matsubara Kanon
 * Shirasagi Chisato
 * Shirokane Rinko
 * Maruyama Aya