Tsumugi Nishihara (Miao Matono) of the archery club is in a slump just before the tournament, and when she opens the room of the "back alley hotel", she is in a strange mountain for some reason. There, his grandfather, Yuo (Takeo Gozu), appears in the form of a hunter. He heard an argument, and Yuo headed in that direction, but he didn't return after a while. While searching for her grandfather, Tsumugi meets a captive girl, Rei Kiriya (Reina Odakura).