Kasahara, Shibasaki, and Tezuka participate in the required promotion tests for librarians. During her time spent on studying, Kasahara panics when she thinks about how the one who saved her during her time as a high school student was Dojo himself. This revelation cripples her concentration to study until Dojo assists her by helping her prepare for the test. In the end, she passes the exams with Shibasaki and Tezuka as well. Kasahara gives Dojo some Chamomile essence oil as a means of showing her gratitude before Dojo asks her to take her to the shop where she obtained the oil so as to try some Chamomile tea.
