A boy was reincarnated into another world as Keiji Takumi. The world that he got transferred into is a combination of our world and that of fantasy, and he is born in an era that resembles the early 20th century. In this world, he strives to be a detective and solve any case that is thrown at him... But most of his assistants are girls that have a crush on him.

Enjoy an urban fantasy isekai novel that I created, which will or maybe will not involve a harem or yanderes.