Search with a Black Light! World Travel with the Yokai Detective Played a few times. There are some minor scuffs, but I think it's in good condition. *Black light not included. Please prepare a black light with a peak wavelength of 375nm m(_ _)m Now, a world tour with Yokai using a black light! When you shine the light on the book... Yokai appear where there was nothing! Become a "Yokai Detective" and solve the problems by finding the pictures.