2017年に初演された同名舞台を映画化した本作。親友を亡くした引っ込み思案の女子高生・穴森一穂が1通の手紙を受け取り、謎の転校生が待つ夜の校舎へと向かうさまが描かれる。。With their Mother dying of cancer, intent on changing her will to benefit her “new” husband before she dies, two brothers go to extreme and deadly lengths to protect their inheritance from being signed away before it’s too late.。