Koshiki Kaori

A client of the main character when he was a newcomer at his job.

She is rich, beautiful, and mature. She is motherly and kind. She is a celebrity, but she doesn't snub her nose at it. She is basically laid back, but sexually active.

She heard about a swapping party that her husband attended overseas, and when she became interested, her husband invited her to the party. She is happy to meet the main character again, who becomes her favorite swapping partner.