Three Sisters Detective Agency -- Undercover Teacher

Author: Kazehaya Jiro
Publisher:
Publish Date: 2004-03-01
Features: Koishi no Yasuko's mother comes to the house of the three sisters to desperately accuse Yuriko of killing her son. Yuriko is forced to investigate and discovers that Koishi's death is related to the wealthy only daughter, Kozue Hayashida. However, Hayashida strangely suffers from amnesia. Hayashida's mother, Kimie, requests Yuriko to investigate the case. During the investigation, Yuriko feels that there are many suspicious points about the elite K-girls' school where Hayashida attends, and the three sisters decide to send Aya to K-girls' school as a undercover teacher. While Aya is undercover at K-girls' school, she is constantly chased by the murderer. Yuriko receives an invitation to meet with Principal Yoshimura from K-girls' school, but she is knocked unconscious with a drug.