Big-assed beauty mature woman Ryoko Murakami finally opens up her anal hole!! Nobuyuki, who was causing trouble for his mother Ryoko due to his poor grades, was being taught by Kazama, a private tutor hired by Ryoko. However, Kazama was the kind of man who would look at Ryoko's plump ass and talk about anal, and Nobuyuki was influenced by him and gradually began to become interested in anal. Then, one day, Kazama handed him a toy to play with his anus. Nobuyuki pushed Ryoko down and began to thrust the toy into her undeveloped anus...