# | Name | Members | Promotions | Active Time | Rating | Votes |
1 | Black Widow | Nagisa Nozaki & Yumi Ohka | WAVE | 2019- | ||
2 | BOSS To Mammy | Mio Momono & Yumi Ohka | Japan | 2017- | ||
3 | Mayumi Ozaki & Yumi Ohka | Mayumi Ozaki & Yumi Ohka | OZ Academy | 2010- |
# | Name | Members | Promotions | Active Time | Rating | Votes |
1 | Black Dahlia | Misaki Ohata, Bambi, Hiren, Yumi Ohka, Ayako Hamada, Cherry, Hanako Nakamori, Mio Shirai | WAVE | 2011-2012 | ||
2 | Black Wave | Misaki Ohata, Bambi, Hiren, Yumi Ohka | WAVE | 2011 | ||
3 | Ozaki-gun | Mayumi Ozaki, Police, Yumi Ohka, Maya Yukihi, Alex Lee, Saori Anou, Kakeru Sekiguchi a.k.a. Kakeru, Hiren, Takako Inoue, Mika Nishio, Arisa Nakajima | OZ Academy | - |