ある日の夜に砂浜で出会った女の子の正体は、現役のスーパーアイドルグループのセンターでした (Associated Names)

One night, while wandering around an unfamiliar place, I met a girl. She turned out to be an extremely popular idol. But why would a girl like that be in a place like this? The encounter between these two weaves together the memories of a certain summer.