Akane (voiced by Yoshioka Riho) and Aoi (voiced by Wakayama Shion) lost their parents and became orphans a long time ago. In order to take care of her sister, Akane gave up the plan to go to Tokyo with her then-boyfriend Shinnosuke Kanemuro (voiced by Yoshizawa Ryo), stayed in her hometown to find a job, and played the role of a substitute mother. In a blink of an eye, 13 years have passed. Now, Aoi has grown up to be a big girl. As a second-year high school student, Aoi does not focus on exams and further studies. She plays the bass aimlessly every day without any motivation. Akane saw all this and felt very anxious. One day, a concert was held in the town. At the scene, Aoi accidentally discovered the figure of Shinnosuke Kanemuro. He returned to this small town! At the same time, Shinnosuke, who was only 18 years old 13 years ago, also traveled to the side of the two sisters.