This is a 4-volume set of "The Twins' Love Affairs." Perfect for enjoying a youth romance story. - Series Name: The Twins' Love Affairs - Author: Shiori Ichinose - Volumes: 4 - Publisher: Shueisha Mirai Bunko - ISBN: 978-4-08-321709-6, 978-4-08-321710-2, 978-4-08-321711-9, 978-4-08-321712-6 Thank you for looking. My daughter was reading these, so there may be minor scratches and wrinkles. Please consider purchasing if you understand that these are used items. Due to the thickness, the books will be packaged simply, with measures taken to prevent water damage, and placed in an envelope.