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Ritsuko Usui (jap. 碓氷律子, Usui Ritsuko) was the main antagonist of "Kogoro Mouri, Suspect". She was a colleague of Eri Kisaki.

She was voiced by Rica Matsumoto.

Past[]

At an unknown date, she began working as a lawyer. She took over an environmental pollution case caused by the surrounding companies. A small village where Norifumi Saku lived was badly hit.

Present[]

Along with her workmates Norifumi Saku, Kenzo Shiozawa, Eri Kisaki, and Yuji Misaka, she travels to a hotel in Karuizawa to recover. There they also meet Eri's husband Kogoro, as well as his daughter Ran and Conan Edogawa. The group decides to go out for a drink together. After some time, Kogoro gets pretty drunk and starts flirting with Ritsuko, which Eri doesn't like at all. After an argument with her husband, Eri leaves the group and can only be calmed down by Ran. When they come back, everyone else has already left. Unable to find Kogoro, Eri and Ran seek advice from Eri's colleagues. Ritsuko can't help them either, but the truth is that Kogoro is drunk from the alcohol in her room.

When there is another knock on Ritsuko's door, an unknown person stands in front of her and kills her. Ritsuko's original plan was to make Eri jealous so she would lose her next trial. Later, her colleagues find Ritsuko strangled while Kogoro was in the room drunk. That makes him the prime suspect.

As it turns out later, she was killed by Norifumi Saku. His motive was the pollution case in which Ritsuko took over the defense. In truth, however, she had little interest in the case and only wanted to trump Eri.

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