Search with a Black Light! Detective Yokai Class in Session Illustrations by Yoshiyuki Yoshimura Invisible pictures appear! A mysterious yokai picture search book - No cover. - There is a small cut at one point along the cut line. See photo 3. - I was able to play with a black light pen sold at the 100-yen store. The pen is not included, so please obtain it separately. m(__)m Due to absence during the Obon period, shipping will be after August 16th.