"Detective Conan: 157 Questions to Cultivate Math Sense by Age 10" Gosho Aoyama / Takuya Fujimaru Price: ¥1500 My child was reading this. There are no noticeable scratches or stains, but it is a used item, so please refrain from purchasing if you are at all concerned. #GoshoAoyama #Gosho_Aoyama #TakuyaFujimaru #Takuya_Fujimaru #book #nature/mathematics