Library Domestic mystery How about an exchange murder?

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Domestic Mystery
Kobunsha Bunko 36-2
I am Kirai KIMIHARA, a sixth grader in elementary school. My future dream is to be a mystery writer. I wanted to hear about the difficult cases that would become the subject matter of the work, so I came to the house of the former detective, Ojiji. Then, I came to the house of the former detective, Ojiji. There were so many mysteries such as the exchange murder, the closed room, and the dying message. My expectation is right now! But, Ojiji. I don't think that the solution is such a thing. It is a fascinating short story that devoted itself to the true mystery through the appearance of a cute famous detective.