partners with who?

Kyoka Jiro is Mute,
Mute: Person who does not speak, either from an inability to speak or an unwillingness to speak.

She has been mute ever since her parents passed away during one of their concerts by an assassination when Jiro was 6.
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Momo Yaoyorozu is going deaf,
Deaf: Lacking the power of hearing or having impaired hearing.

She has been hiding this secret from everyone, including her own parents and friends.