Fuyo OGURI wrote 'Koizame' in his attempt to follow after Katai's 'Futon' by focusing on the 'love of a middle-aged person', yet this theme was partial compared to the dense themes of 'Futon' and OGURI could not participate in the community of naturalism movement.
小栗風葉は「中年の恋」という主題にのみ着目して、「蒲団」に続いて「恋ざめ」を書いたが、自然主義陣営の仲間入りはできなかった。