By Tomohiro OsakiAgence France-PresseKUMAMOTO, Japan — Inside Koichi Miyatsu’s blue, child-sized backpack are neatly folded cartoon-print sweatshirts and a pair of white sneakers — all he has from before he was left at Japan’s only “baby hatch”. He was only a toddler when he was placed in the hatch at a hospital in southern Japan’s Kumamoto, where children can be left