Yuria Tsukino, a 19-year-old young lady from Nagano Prefecture who moved to Tokyo after graduating from middle school to enter a boarding high school, makes her AV debut. - She has only experience with men, and her sexual awakening, which appears to be docile at first glance, is based on an erotic novel written by her father. - This time, after breaking up with her older boyfriend, she decides to appear in an AV in search of the adult world and sex that she has never known before.