Satomi Yamamoto, a librarian at Keishin Girls' High School who lives with her homeroom teacher Ayako, is in love with Ryoko Sawaki, who always comes to the library at the same time. Satomi unexpectedly has an opportunity to exchange voices with her. She gives Ryoko a card asking her to buy a book, saying that she had it herself, but she wanted everyone to read it as well. "What kind of book is it?" she asked, and she answered that it was about a love story between girls. Satomi immediately bough...