Tamaki Book Cafe manager Yujiro visits Akiko's home to purchase some books. Ten of the books are rare and valuable, but they apparently belong to her hospitalized husband, so Yujiro declines to buy them and tells Akiko to get her husband's permission to sell them. That evening, Sawada arrives at the store and shows Yujiro a picture on his phone of about ten old books and asks how much they're worth. Yujiro tells him it depends on their condition, but they're worth at least two million yen. The next day, the rare books are stolen from Akiko's home. Akiko believes Yujiro stole them, but...