As unease from his recurring visions grows, Hikaru decides to investigate the mysterious chamber at Izumo Gakuen that has appeared in his dreams. Accompanied by Miyuki, Nanami, and Nagisa, he slips inside after hours and discovers ancient markings that seem to echo the shrine maiden’s silent ritual. The discovery sparks quiet tension among the group while hinting at a deeper connection between the school’s past and the enigmatic figure. With each new clue, the ordinary school day gives way to the first steps of an unforeseen journey.