The Descendants of the Classic Literature Club with its Circumstances

Eru tells Houtarou about a past memory in which her late uncle told her something about the Classics Club that ended in her being distressed, with her uncle strangely not trying to calm her down at all. Wanting to remember what it was, she asks Houtarou for help and he somewhat agrees, making moves to recover the past anthologies to find a lead to uncovering the mystery.