Arai Hirono (新井寛乃) is a former Japanese singer. She was a member of the group Fudanjuku, where she was known as Midorikawa Kyouhei. She was also a member of Nakano Fujo Sisters, prior their debut, where she was known as Piro. She retired from show-business in 2010 due heath issues.
- Stage Name: Arai Hirono (新井寛乃)
- Fudanjuku Stage Name: Saiki Kanbee (彩黄 寛兵衛)
- Nakano Fujo Sisters Stage Name: Piro (ぴろ)
- Birthdate: April 9, 1987
- Birthplace: Saitama Prefecture, Japan