Ran Kotobuki and her friend, Miyu Yamazaki spend most of their waking hours in the district of Shibuya, where they encounter Rei Otohata and Yuya Asou, the first and second place winners of the Super High School Student Grand Prix. Ran also meets Aya Hoshino, an academically strong classmate, but it is rumored that she has been involved in Enjo kosai.