Yoshiko Kayama appears only in anime episode 018. She is famous for her doll-making skills, and during the episode, she has a widely promoted doll exhibition at the Juuban Art Museam. The young doll maker Mika Kayama is Yoshiko's daughter. Mika is also quite well-known for making dolls, as she recently won a French doll contest. Yoshiko is very supportive of her daughter's craft, and tries to promote her work whenever possible. For this reason, she invites Nephrite (who was disguised as a doll enthusiast) into her home to meet Mika. When he sees a doll that the young girl made, he secretly plants his evil crest on it to cause Mika to reach her peak energy.
Yoshiko's seiyuu is Miyoko Aoba.
Episode 018 - Shingo no junjou! Kanashimi no France ningyou
Juuban Art Museam