With the arrival of autumn, Koguma and Reiko's attention turns to getting ready for winter. When the class culture festival committee runs into a snag getting what they need for their activity, the pair volunteer to use their Cubs to come to the rescue.

Koguma rushes to the narrow dirt road on her Cub to find Shii, who is half-submerged in a freezing river. She takes her back to her apartment to warm her up and dry her out, but Shii soon reveals that she has other, deeper issues with the winter weather.