Kara no Shoujo: vol.1
Reiji is a private detective. One day, he receives a strange offer from a girl, "Please search for... me. True me." At that time, series of abnormal happened and Reiji was offered to investigate it. There is a girls' high school Yukari and two female students are missing.. Reiji's younger friend goes there, too. Toko, the vice principal of the school, offers Reiji to search for them. As a result, Reiji receives three offers at the same time. To gather information, he starts working at the school in disguise and meets Toko, who asked him to search for real her before. "Hi, nice to see you again, sir."