The scriptwriter Okada Yoshikazu said that he had wanted his trusted comrade Kanno to take on the role of Setsuko so he approached her about it quite some time ago. However, she was already scheduled to take part in "Beppin-san" then. Nonetheless, Okada still wanted her to play Setsuko so he was glad that she could take on the role especially since the relationship between Setsuko and Mineko is a very important element in the second half of the story. Kanno commented that she had worked with Okada many times to date but this is probably the most gentle story from him to date and she is honoured and very happy to be able to participate in this drama and work with the cast and staff.
Sources: Oricon / Sponichi