Hinata Aoi (miwa) and Hasegawa Riku (Sakaguchi Kentaro) are childhood friends. They formed a band with their friends Matsuda Naoya (Ryusei Ryo) and Nakamura Tetsuta (Izumisawa Yuki). Naoya has always liked Aoi silently, and he decided to express his feelings at the summer festival. However, Aoi's eyes have always been following the cold and lonely Lu. In his gentleness and indifference, Aoi can't be sure what position she exists in his heart. On the day of the summer festival, the band performed on stage, and the absent-minded Aoi died in a traffic accident after messing up the whole performance. However, when she opened her eyes again, she found that she had returned to a week ago. This incredible experience made her discover the secret that Lu had been hiding, and also made the relationship between the two people develop by leaps and bounds. However, no matter how hard she tried, Aoi would eventually die in the evening of the summer festival. In order to keep her beloved by her side, Lu traveled through time and space again and again.