Eru discusses the mystery of her uncle, whose words made her cry when she was young. She wants to remember what he said to her and what happened to him. Hōtarō agrees to help. After mid-term exams, he receives another letter from his older sister revealing the location of past anthologies from the Classic Literature Club, located in the Biology Room, now used by the News Club. Hōtarō figures out the News Club's president was smoking tobacco, and then blackmails him to get the past anthologies. As Eru is confident that she can solve her uncle's mystery from the anthologies, the very first edition of the anthology is revealed to be missing, shocking her.