宝马山奇案

1945年在广西黔江红石滩上，曾发生过一场以少胜多、以弱胜强的战役，面对300多名的日军精锐，广西义勇军凭借红石滩天险设下“死亡陷阱”激战15小时，击毙120多名日军，狠狠地打击了日寇，极大鼓舞了当地民众的抗日斗志。

被突然的任命令从东京派遣到海外工作的研究员·想太（森崎温 饰），在曼谷与学生时代一直暗恋的凯（向井康二 饰）再会。看到在泰国作为摄影师兼音乐人活跃的凯的身影，内心产生了动摇。另一方面，小凯也对学生时代唱过的“未完成的歌”感到惊讶。将两人联系在一起的歌声再次在心中响起……

　　A team of influencer bloggers decides to hold a ritual at the mansion of the "black countess". A fan of the supernatural, she disappeared without a trace after she was offered to play a game that was supposed to take her to another dimension. By evoking the spirit of the Countess, bloggers let otherworldly forces into the world. The one who can bring the demons back will survive.