Ep. 4: The group assists Sumika in creating POP signs for library books
Aired on October 28, 2016

The characters work together to help Sumika design Point of Purchase advertising signs. Their goal is to attract attention to their favorite books located in the library. This collaborative effort focuses on creating visual displays to highlight specific titles within the library setting.
Episodes
- Ep. 1 · Machida Sawako, known as Miss Bernard, visits the library but finds reading too much work
- Ep. 2 · Librarian Sumika approaches Endou over his book while Sawako seeks sci-fi picks from Shiori.
- Ep. 3 · Sawako contemplates the proper method for interpreting Murakami Haruki's literary works
- Ep. 4 · The group assists Sumika in creating POP signs for library books
- Ep. 5 · Shiori Educates Sawako on Japan's Three Greatest Mystery Novels
- Ep. 6 · Shiori Educates Sawako on Japan's Top Three Mystery Novels
- Ep. 7 · A narrative centered on the activities and interactions within used bookstores.
- Ep. 8 · Sawako and Endou discuss Fermat's Last Theorem at Shiori's workplace