Set in a fictional European country in 1924, a Japanese exchange student meets a mysterious, brilliant girl who only leaves the library to sleep. Her brother, a detective, relies on her exceptional mind to solve difficult mysteries.

• Hidenobu Kiuchi
• Noriko Shitaya
• Yui Kano
• Miyuki Sawashiro
• Takuya Eguchi
• Toru Okawa
• Michiko Neya
• Aoi Yuki