青春期的妹妹

 时长半小时的短片。故事是发生在TV版中途的番外篇，突出两位女主角的位置，并附带“歌姬”设定……主题曲延用TV版前半部的OP（但收录进剧场版时被取消）。

　　Driving home late at night during a heavy rainstorm, Glen experiences car trouble. Near where his car gets stuck, he spots a house, knocks on the door and is greeted by an oddly friendly middle-aged man, Arthur, and his younger wife, Cyndi. The strange couple pours him a drink, and then more drinks, followed by an unexpected offer that Glen can’t refuse. Elsewhere, a young woman, Katie, is feeling emotionally weighed down by a secret romantic arrangement that feels like a textbook case of gaslighting. And at the same time, in a nondescript research facility, medical professional Julie begins questioning her role in a bizarre experiment, fearing that she’s doing more harm than good.

　　The story centers on a group of strangers trapped in a time warp house where a terrible event transpired exactly 100 years prior.