1983年初夏,为了父亲的画作,前原圭一(前田公辉 饰)随家人从东京搬到了偏僻的雏见泽村。这个小山村风景秀丽,舒适怡人,村中的学校里更有一群清纯美丽、性格开朗的女孩子,原本还心有不快的圭一很快和同班的龙宫礼奈(松山爱里 饰)、园崎魅音(飞鸟凛 饰)、北条沙都子(小野惠令奈 饰)、古手梨花等几个女孩成为了好朋友。 某日,圭一从摄影师富竹(谷口贤治 饰)口中得知,四年前雏见泽村筹划修建大坝时,监工曾被人残忍杀害。自此每到庙会之夜,便会有一人死亡,一人失踪。圭一将此事告诉好友,却得到否定的回答。随着庙会的临近,好奇心颇重的圭一不可避免进入扑朔迷离的漩涡之中……Early summer, Keiichi had just moved to a remote mountain village. As he becomes close friends with a group of girls, he was enjoying his life in the village. However when he starts to become suspicious that Rena, Mion and the others that Keiichi trusted may be deeply involved in successive murders that occur every summer, the situation around Keiichi gradually starts to turn. As if the girls' characters had completely changed, a sewing needle is found in his food, he is chased by mysterious men, and is involved in an accident which could have killed him. He could no longer trust anyone, and then one mystery leads to another, bringing out a shockingly bloody ending.