Nobuko Yoshiya (吉屋信子 Yoshiya Nobuko) was a Japanese novelist active in Taishō and Showa period of Japan. She was one of modern Japan's most commercially successful and prolific writers, specializing in serialized romance novels and adolescent girls’ fiction, as well as a pioneer in Japanese lesbian literature, including the Class S genre. Several of her stories have been made into films. Nobuko Yoshiya on Wikipedia.