Yasaka Hajime came to the countryside to spend his summer holiday at his grandfather's house. After losing his way, he decided to take a break at a local coffee shop. There upon his arrival, he met Arashi, an older girl who was waitressing there, and was completely taken aback by her. Casually, he took a seat next to another local student, Kamigano Jun, and started talking to him about how wonderful Arashi is. Unbeknownst to Hajime, a figure with a scary face hidden behind sunglasses entered. Calling himself a private investigator, he informed them what he was looking for and then kidnapped Arashi...

夏休みを祖父の家で過ごすために田舎へとやってきた中学一年の少年・八坂一。道に迷って困り果てていた彼は、ひと休みしようと喫茶店・方舟に入る。そこでウェイトレスとして働いている“あらし”という年上の女の子に一目惚れをする。たまたま隣の席に座っていた地元の中学生・上賀茂潤にあらしの素晴らしさについて熱弁を振るっていると、店にサングラスを掛けた強面の男やってきた。私立探偵だと名乗るサングラスの男は「身内の人が探している」と告げると、無理矢理あらしを連れ去ろうとする。