Convinced that her mother Chieko (Narumi Yasuda) has stolen the key to the safe, Shioriko Shinogawa (Ayame Tsuyoshi) aims to solve the code and obtain the code letters before Chieko does. Later, when Shioriko and Daisuke Goura (AKIRA) return to Biblia's Bookstore, they find Chieko sitting at the counter reading a book. Chieko asks Shiori what she thinks is in the safe.