Rumi Shiranui is Ryukyu's younger sister and her exclusive photographer. - One day, she was practicing photography with Shijo-kun, who was introduced to her by Ryukyu, but she doesn't seem to be improving at all... - When the two of them were troubled, Rumi said, "Maybe it's difficult because people aren't the subjects...I'm embarrassed, but I'm going to be the subject!" - Thus, the photo session with just the two of them began.