Over coffee, Eru opens up to Oreki to explain why she joined the club, and asks him for his help with a personal matter. Still unable to locate any anthologies, the club members run into an obstacle when trying to search the club's previous room.

Hotaro tells Eru that he can come up with a plausible explanation for any situation she can think of, so when a seemingly mundane schoolwide announcement is made, she challenges him to figure out the reason behind the announcement.