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Instructor at the Kyokugenryu Karate Dojo in the town where the main character lives.
She's an unprecedented young lady who's been single-mindedly devoted to karate since she was a child, has many masculine behaviors, and invites the main character to the Kyokugenryu Karate Dojo after being impressed by his martial arts sense when she bumped into the main character at high speed at a street corner. It seems she also has her own troubles that she doesn't show to others.