Tsukiko Otonashi is a fashionista who is too beautiful to be a detective.

She is also intrigued by urban legends so much so that she believes all crimes are somehow linked to these legends. She even conducts her investigations in such a way as to prove them to be true.

Tsukiko also likes to make use of whatever she can. She especially likes to enlist the help of crime lab officer Hitoro Katsuura, who happens to have a crush on her. Many other unique characters will make appearances as she investigates the crimes related to urban legends, using odd and exquisite techniques.