The Hokkaido district representative, Shinryaksha, is forced to temporarily return to Hokkaido for the school's summer school day. On the way back home, Mone Ishiya talks about the seven urban legends of Hokkaido, and Chihori Hokuto blurts out that the universe exists. As usual, Yuina Rokkatei makes remarks about their bizarre story, but the moment she makes a remark, a strange feeling wraps around her――!?