A small detective office in a non-descript back street shopping center, there is Goro Asami, a private detective, competent in his job, with business going well, but not well enough to live in wealth. There is Otomi Kiyosato, a student of Siratori High and the founder of the "Beauty Private Detective Club, one of the stranger clubs in that school, being an absolute pain in the ass by claiming to be Goro's assistant and inviting herself to his office enough to absolutely drive him up the wall.
During this period of relative bliss, an unexpected incident shatters the peace of Siratori High. Mari Kitagawa, the chief manager for the Creative Literature Club, is found dead with massive doses of tranquilizers and sleeping pills in her body. From the location of the body and the means of her death, the police initially declared this to be a suicide, but by the following day, they abruptly change their stance by issuing a cryptic statement that "Her death was not from suicide." Rumors spread throughout the high school like wildfire, and Otomi and her fellow detective club members began investigating the case. Goro also begins investigating this strange case, after being hired by the victim's father. With Otomi's cooperation, each step of the case gradually comes to light. Yet, before the case could be determined to be murder or suicide, Tomoko Andou is found raped and murdered at the thicket of the high school's rear compound. What is going on? Are the deaths related? Who wrote that mysterious notice, "Who's next?" on the board?
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During this period of relative bliss, an unexpected incident shatters the peace of Siratori High. Mari Kitagawa, the chief manager for the Creative Literature Club, is found dead with massive doses of tranquilizers and sleeping pills in her body. From the location of the body and the means of her death, the police initially declared this to be a suicide, but by the following day, they abruptly change their stance by issuing a cryptic statement that "Her death was not from suicide." Rumors spread throughout the high school like wildfire, and Otomi and her fellow detective club members began investigating the case. Goro also begins investigating this strange case, after being hired by the victim's father. With Otomi's cooperation, each step of the case gradually comes to light. Yet, before the case could be determined to be murder or suicide, Tomoko Andou is found raped and murdered at the thicket of the high school's rear compound. What is going on? Are the deaths related? Who wrote that mysterious notice, "Who's next?" on the board?
嘴里嚷嚷着梦想，被嫉妒蒙蔽双眼的TA；在谎言与幻想中迷失道路的TA。以女校学生自杀事件展开调查，五郎和音美双视角切换，得知真相，犯人很好猜。音美这“美少女侦探俱乐部”真的有了另外俩位美少女了还行，我那三人组呢？最后音美也是经典出事，五郎去救。EX看了下好像有点拉，就不补了，这系列打到这，最喜欢的是3代。
该系列可以说是侦探系ADV的始祖作品