Miku and Sana approach Sensei after class — they're on cleaning duty, but don't know where the cleaning supplies are. Nor does Sensei, but since they're both anxious to get their cleaning done in time for their other commitments, he agrees to help them look. While they're doing so, Miku talks a bit about how she and Sana go way back to first grade, and Sensei complains about paperwork. They eventually find some supplies in a closet which is conveniently ajar, although Sensei draws the line at actually helping them clean.